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INTRODUCTION
Nanotechnology has transformed biomedical research and healthcare by providing advanced methods for disease diagnosis, drug delivery systems, and tissue regeneration. Apart from other metallic nanoparticles like gold and silver, the Carbon-Based Nanoparticles (CNPs), including Carbon Dots (CDs) and Carbon Nanotubes (CNTs), are classified into Single-Walled Carbon Nanotubes (SWCNTs) and Multi-Walled Carbon Nanotubes (MWCNTs), carbon nanospheres (CNs) and Carbon Nanodiamonds (CDs). Carbon nanoparticles have a wide variety of biomedical applications, such as drug delivery, (Girigoswami, K., & Girigoswami, A. (2025). bioimaging, anti- bacterial, anti-viral properties, and cancer therapy, and also wound regeneration, tissue engineering and invitro diagnostics, they show good biocompatibility and solubility.
Green synthesis is more efficient because of 1) Eco-friendly and Reduced Toxicity; its uses natural precursors including plant extracts or microbes which are found to be safer and less polluting. This study reveals that green synthesis of carbon nanostructures is low-cost, and convenient method (Qasim et al., 2023). A study by Vasimalai et al., reports low-toxicity diagnostic and therapeutic pathway for selective tumour cell inhibition (Vasimalai, 2018). Several studies show 2) Low energy consumption and cost is only needed for green synthesis nanoparticles, this study shows the synthesis of Carbon Dots (CDs) from watermelon peel by the NaCl-facilitated carbon dot method, so it reduces more energy consumption than the other chemical methods (Wu and Huang., 2024). A study on bio-mediated synthesis of Carbon Quantum Dots (CQDs) from nutshells for advanced performance in Dye- Sensitised Solar Cells (DSSCs) conveys that using the hydrotherma, microwave-assisted method at a lower temperature below 200 degrees Celsius for a shorter method indicates reduced energy use compared to other chemical synthesis (Yu et al., 2025). 3) High scalability This study introduced a scalable, green -synthesised single-step method for synthesising carbon nanotubes with high catalytic performance (Gang et al., 2023). 4) Biocompatible surface A study reports that carbon dots synthesised from a natural plant called Pollen Typhae (PT-CDs) exhibit a high biocompatible surface due to their low cytotoxicity which shows low haemolysis rate, and exhibit high cell biocompatibility. And PT-CDs exhibited no nephrotoxic effects toxicity in the kidney biochemical parameters; this makes carbon dots from PT-CDs suitable for biomedical use.
This review highlights that the green synthesis of carbon nanoparticles from biomass act as more eco- friendly, highly scalable and low in cytotoxicity than other methods. In this review we discuss the various methods of green synthesis and types of carbon nanoparticles. In addition, we described the application and types of carbon nanoparticles on wound healing (Figure 1).
METHODS OF GREEN SYNTHESIS OF CARBON NANOPARTICLES
Carbon Dots (CDs), Carbon Quantum Dots (CDQs), fullerene (C60 A study shows bio-mediated synthesis of carbon dots from Buchnania lanzan leaf extracts through 1) Solvothermal treatment shows good fluorescent property; the Fourier Transform Infrared spectroscopy (FTIR) spectrum indicates the existance of functional groups on the surface acts as stable scaffold for drug delivery and bio imaging (Jana and Dev, 2021). A study exhibits the preparations of high quantum efficiency of green fluorescent Carbon Dots (CDs) by using a simple 2) Hydrothermal technique with excellent pH and salt stability, and this study claims that these CDs are applicable for fingerprint detection and selective probes for Fe+ detection in environmental and biological systems (Li et al., 2019). In a study exhibiting green 3) Microwave assisted method used for green synthesis of Carbon Quantum Dots (CQDs) from Viburnum opulus fruit extracts results in high fluorescence, good water solubility, and biocompatibility, and it aims to be applicable in bioimaging and environmental sensing (Dayan, 2019) (Thirumalai, A. et al, 2025). A study shows that Carbon Quantum Dots (CQDs) synthesized from silk fibroin through micro -assisted method exhibit high crystallinity, strong fluorescence, low toxicity and high biocompatibility, promising that they are applicable in biomedical applications, bioimaging and drug delivery (Wang et al., 2020). In a study the green synthesis of Carbon Dots (CDs) from cellulose and lignin through the solvent-free 4) Pyrolysis method and its very excellent selectivity in Fe+ ion detection, so they claim that these Carbon Dots (CDs) are a potential indicator for environmental sensing applications (Chen et al., 2022). In a study, green synthesized Carbon Quantum Dots (CQDs) from neem bark powder via 5) Ultrasonification exhibit strong fluorescence and water dispersibility and show high methylene blue removal capacity (Basha et al., 2024). This study outlines green synthesized Carbon Quantum Dots (CDQs) using hydrogen peroxide (H2O2) assisted 6) Hydrothermal Oxidation (Chemical Oxidation) from nutshell biomass. The product of 3 nm CDQs shows strong fluorescence, water stability and functional surface properties (Yu et al., 2025). This study demonstrates the green synthesis of nitrogen and sulfur co -doped Carbon Quantum Dots (CDQs) from lignin using 7) Chemical Oxidation which shows high fluorescence, water solubility, and it is applicable for bioimaging (Zhu et al., 2021). In this study et al demonstrates the green synthesis of Carbon Nanotubes (CNTs) from the plant extracts (Neem, Walnut and Rose grass) using 8) Chemical Vapour Deposition (CVD). It exhibits low toxicity, reduces energy consumption through this method, and yields high purity (CNTs) (Tripathi et al., 2017). A study exhibits the synthesis of hollow Carbon Nanospheres (CNs) by 9) Arc Discharge method utilising copper as both a catalyst and a transient template, resulting the nucleation of carbon on the copper surface with high crystallinity, scalability and biomedical applications in drug delivery systems (Hu et al., 2016). This study demonstrates that green synthesized carbon microstructures from biomass using femtosecond 10) Laser Ablation result in good porosity, conductivity and thermal stability, and they are suitable for applications in sensors, electro catalysis, environmental monitoring (Tavangar et al., 2013). A study exhibits the carbon nanofibers synthesized using lignin with Polyvinyl Alcohol (PVA) through 11) ElectroSpinning followed by Stabilisation and Carbonisation This yields porous, conductive and thermally stable CNFs show high surface area and mechanical integrity (Kumar et al., 2019). This study demonstrates that bio-mediated synthesis of nanoporous carbon using plant stems of Ipomoea Carnea and a nickel foam template. 12) (Template Assisted Growth) followed by thermal carbonization at 800ºC after chemical activation steps results in extensive surface area, tiny pores, and advanced performance in super capacitors with nonporous carbon (Kumaresan et al., 2019). A study on the synthesis and characterization of bio-based carbon nanoparticles from lignin applying 13) freeze-drying - induced self-assembly and carbonisation yields uniform particle size, non- agglutinated carbon nanoparticles and enhanced porosity (Gonugunta et al., 2012).
Carbon Dots
Carbon dots are a class of carbonaceous nanomaterials, possess sizes below 20 nm. Carbon Dots (CDs) are classified into Carbon Nanodots (CNDs), Polymer Carbon Dots (PCDs), and Graphene Quantum Dots (GQDs) (Liu et al., 2015). Carbon Nanodots (CNDs) are carbonaceous particles with crystal lattice and without crystal lattice are called Graphene Quantum Dots (GQDs) contain a single layer of carbon core conjugated with different chemical groups at the surface. In this demonstrates that the production of carbon dots from six medicinal plants exhibits strong antioxidant properties and low toxicity leading to great potential in future biomedical applications (Nascimento et al., 2024). This study demonstrates Carbon Quantum Dots (CQDs) from waste nutshell bio-mass using hydrothermal approach with hydrogen peroxide (Yu et al., 2025). This study represents the green synthesis of Carbon Quantum Dots (CQDs) from waste lignocellulostic pulp, shows potent fluorescence, antioxidant and antibacterial properties (Lee, and Ko, 2025).
Therapeutic application of Carbon Dots
This study develops a nanodrug delivery system using carbon dots that shows high therapeutic efficiency, HER2- el targeted specificity and pH- triggered release with the chemotherapeutic drug Docetaxel (DTX) (Li et al., 2021). This study establish green synthesized Carbon Quantum Dots and their silver composite structure. Mishra et al., tested on HCT-116 colorectal cancer cells with CQD/Ag nanocomposites and established anti-cancer effects through Reactive Oxygen Species (ROS) mediated mitochondrial apoptosis. The CQD/Ag nanocomposites work as both an anticancer agent and bioimaging probe, leading to new directions for nanotechnology (Mishra et al., 2023). Wang et al., demonstrate green synthesized Carbon Dots (CDs) <10 nm through in vitro and in vivo, cell line studies exhibit strong anti-inflammatory and anti-oxidant properties through suppressing ROS, interfering with lipid peroxidation, conserving mitochondrial function inhibiting stress-induced apoptosis and stabilize normal cellular functions (Wang et al., 2023). This study presents green synthesized carbon dots from Traditional Chinese Medicinal sources (TCM), Rubia cordifolia L., Junci medulla carbonisata, Cirsium setosum using the hydrothermal method. Through in vivo models they promised the anti-inflammatory protection and promote hemostasis and low cytotoxicity, leading to non-toxic nanotechnology therapeutic system in future (Han et al., 2023). In this study demonstrates green synthesized carbon dots from silkworm cocoon by hydrothermal method targeted to accelerate of hemostasis, promote cellular repair and tissue regeneration by platelet aggregration, induce fibrin formation, and reduce Prothrombin Time (PT) and Activated Prothrombin Time (APT) using an animal model. They revealed SC-CDs, silk worm cocoon-derived Carbon Dots (CDs), elevate fibroblast regeneration and increase collagen deposition, anti-inflammatory properties and show less toxicity (Wu et al., 2025).
Carbon Nanotubes (Cnts)
Carbon nanotubes are cylindrical nanostructure from hexagonal carbon lattices exhibit a helical twist around the tube axis. Carbon nanotubes are classified into two depending upon the presence of layer: Single Walled Carbon Nanotubes (SWCNTs), Multi Walled Carbon Nanotubes (MWCNTs), and other types (Torodial Carbon Nanotubes (TCNTs), Helical Carbon Nanotubes (HCNTs), Bamboo Carbon Nanotubes (BCNTs) (Zhao et al., 2023). In SWCNTs there is a single layer graphene that is folded to produce a tubular structure. In MWCNTs there is three to five sheets of SWCNTs folded up together to form a multi-layer structure (Singh et al., 2016). In this study Alhajiri et al., demonstrates the green synthesized Silver functionalized MWCNTs using Olea europea (Olive) leaf extracts. This MWCNT-Ag nanocomposite shows strong antibacterial properties and low cytotoxicity. It has potential application in
Drug delivery, wound healing and biosensors (Alhajri et al.,, 2022). In a study Sasrimuang et al., presented green synthesized Carbon Nanotubes (CNTs) using Water Hyacinth through Chemical Vapor Deposition (CVD). This study aims to demonstrate the green synthesis of nanoparticles through eco-friendly transformation of bio-Waste mass. Water hyacinth consists of alumina and silica, so there is no need for the use of metal catalyst during the process (Sasrimuang et al., 2020). Kumar et al., synthesized aligned CNTs bundles using neem oil (Azadirachta indica) via spray pyrolysis (Kumar et al., 2011). This study demonstrates the green synthesis of MWCNTs from methyl ester of moringa (Moringa oleifera) oil through CVD. Further supporting a study shows the potential of plant -based oil in the development of nanomaterials (Kalaiselvan et al., 2018). In this study demonstrates that the PEG - functionalized Single-Walled Carbon Nanotubes (SWCNTs) are efficiently used for both non -invasive tumor imaging and photothermal cancer therapy. The PEG- SWCNTs aqueous water solubility, biocompatibility and cytotoxicity effects and excellent biocompatibility (Singh et al., 2024).
Biomedical application of Carbon nanotubes
In this study Unai et al., developed a green synthesized nanocomposite: Hydroxyapatite (HAP), MWCNTs and silver doped with silver core selenium shell configuration Anti- microbial nanoparticle this Nano composite shows strong antimicrobial activity and comparing the three nanocomposites HAP and HAP/MWCNT didn’t exhibited any anti-microbial properties, while Ag-HAP/MWCNT demonstrates an intermediate anti- bacterial effect and Ag@ Se HAP /MWCNT Nanocomposites manifest a high potential antibacterial effect (Unai et al., 2025). In another study silver -substituted hydroxyapatite functionalized MWCNTs nanocomposites (Ag-HA/f-MWCNTs) developed on 316L stainless steel by spray pyrolysis this study result showed Ag-HA/f-MWCNTs nanocomposites possess high potential antimicrobial property, high cytocompatibility, blood compatibility and enhanced anticorrosive properties. Ag-HA/fMWCNTs coating surfaces provide a versatile surface for dental and orthopedic fields (Sivaraj et al., 2019). This study demonstrates that the green -synthesized MWCNTs functionalized Ag-NPs possess enhanced antibacterial property and reduced cytotoxicity and can be used for therapeutic applications including anti- septic biomaterials, topical wound treatment (Seo et al., 2018). You et al., developed MWCNT-AST and MWCNT-Ag nanocomposite with astaxanthin (AST) exhibits enhanced antioxidant activity and strong anti- biofilm activity. They revealed MWCNTAST shows potent anticancer activity in MDA-MB - 23 breast cancer cells with MWCNT-AST-10 shows lower cytotoxicity than MWCNT-Ag (You et al., 2025) ( Biswas, K. et al, 2025).
Carbon Nanospheres (CNS)
The study demonstrates green one-step hydrothermal approach to synthesize Carbon Nanospheres (CNs) from bacterial cellulose, with potential application in cancer -targeted drug delivery. In this study here Doxorubicin (DOX)- loaded CNs showing minimal drug release in normal tissue and accelerated release in the tumor environment. This approach enhances healing potential against cancer cells and reducing side effects on healthy cells (Robinson et al., 2010). Carbon nanospheres (CNs) are spherical in shapes, composed of carbon material. In a study, Nieto-Márquez et al., classified CNs into three according to their structural features: concentric, radial, randomly oriented carbon layers (Márquez et al., 2011). Han, et al., synthesized nitrogen doped Hollow Core- Mesoporous Shell Carbonaceous Nanaospheres (HCDMSs) from Glucosamine Hydrochloric Acid (GAH) carbohydrate derivative, showing high specific surface area, sufficient nitrogen content, adaptable shell thickness and size (Han et al., 2014). The study reported the synthesis of blue -fluorescent Carbon Nanospheres (CNs) from the pith of tapioca (Manihot esculenta) via a one- step hydrothermal process exhibiting high detection sensitivity (Nima et al., 2020). Similarly, Chopra et al., presents green synthesized Carbon Nanospheres (CNs) from banana peels through microwave -assisted method and revealed this Carbon Nanospheres (CNs)produced in acidic environment were uniform and shows potent solubility and photostability (Chopra et al., 2024). Bhavya krishnappa et al., developed green synthesized carbon nanospheres (CNs) from Oil Palm Leaves (OPL) biowaste through a pyrolysis process, resulting uniform -sized carbon nanospheres with excellent colloidal stability, recyclability and high adsor[ption capacity (Krishnappa, et al., 2022). In this study synthesized Mesoporous Carbon Nanoparticle (MCNs) using hard template method for the delivery of anticancer drugs (Camptothecin). These MCNs exhibits sustained controlled release, efficient intracellular uptake, and prolonged drug release, for targeted cancer therapy (Liu et al., 2015). Another study developed the green synthesis of Mesoporous Carbon Nanospheres (MCNs) from agro-waste through a onepot pyrolysis method. These MCNs were effective against gram -negative bacteria, making them antimicrobial nanomaterials applicable in biomedical and health fields. Long chen et al., developed mesoporous carbon nanocomposites using cotton fabric and iron nitrate as precursors via an impregnation - carbonization process (Chen et al., 2016). This study presents hydrophilic MCNs through templating and hydrothermal processes, which demonstrates high potent in drug- loading capacity for camptothecin (Gu et al., 2011). Futhermore the synthesis of mesoporous Carbon/Copper Sulfide (CUS) nanocomposites using hard-template hydrothermal method obtained (MCN-CUS) mesoporous carbon capped with copper sulfide, showed high potent in drug -loading capacity for Doxorubicin (DOX) and exhibited potent Near-Infrared (NIR) absorbance is applicable for the photothermal treatments (Zhang et al., 2015).
Biomedical application of Carbon nanospheres
Manaf et al., successfully developed carbon nanospheres from sago hampas through catalyst- free pyrolysis resulting biocompatible, high colloidal stability, uniform sized nanoparticle suggesting for bio imaging, drug delivery and biosensing (Manaf et al., 2015). In another study, Sulphur -and nitrogen-co-doped carbon Nanospheres were synthesized from Hibiscus sabdariffa L. flower extract via a hydrothermal method. The resulting uniform-sized carbon nanospheres exhibited enhanced hydrophilicity. Hussain et al., reported this as a nature corrigendum to green synthesis of Sulphur- and nitrogen- co-doped carbon nanospheres and their application as efficient adsorbent for Pb (II) ions from aqueous solution due to the presence of sulphur and nitrogen (Hussain et al., 2020).
Nano-Diamonds (NDs)
Nanodiamonds (NDs) are sp3 -bonded and tetrahedral bonded to four substituent groups like OH, C=O, CH2/CH3 (Gopinath et al., 2022). A study developed carbon nanodiamonds in under low temperature by the microplasma induced dissociation of ethanol vapour. And hydrogenation phase leads to purification and removes non -diamond carbon and stabilized nanodiamonds results high quality 2-3 nm ultra small nanodiamonds (Kumar et al., 2013). A study demonstrated NDs can be incorporated with living microorganisms (Paramecium caudatum and Tetrahymena thermophilia) can be used as consistent intracellular probes. They studied both 5 nm and 100 nm NDs, the smaller 5 nm showed higher toxicity when compared to 100 nm NDs due to their defective surface carbon. Through fluorescence and dynamic scattering imaging proved that NDs have stable fluorescence signal in intracellular without photobleaching making them as suitable long -term bioimaging and their properties like biocompatibility and low cytotoxicity suggests that NDs exhibit high potential as bio- labels, drug delivery systems in biomedical applications (Lin et al., 2012). This study developed carbon Nanodiamonds (NDs) using the biopolymer butanosolvent lignin through the pyrolysis method (Feng et al., 2024). Lin et al., demonstrated Nanodiamonds (NDs) from biomass - derived carbon films using a nanolignin /cellulose nanofibril (LCNF) composite, resulted in uniform sized carbon Nanodiamonds (NDs) (Lin et al., 2021). This study reported the carbon Nanodiamonds (NDs) from ethanol through laser irradiation, resulting stable Nanodiamonds (NDs) crystals (Nee et al., 2016). Another study developed carbon nanodiamonds via a liquid - phase plasma process using ethanol, which resulting eco-friendly, high scalable uniformly sized, and crystalline nature carbon Nanodiamonds (NDs). Figure 2: Illustrate the green synthesis of carbon nanoparticle and its application on wound healing.
wound healing and carbon nanoparticle
Yu et al., successfully synthesized carbon dots from sucrose, glucose, and fructose via green wet chemical method exhibited strong antibacterial properties with enhanced wound healing, providing an effective approach for topical therapies in wound management (Yu et al., 2025). Roy et al., reveals the green synthesis of (ZN-Cur CDs) Curcumin - derived carbon dots doped with zinc ions via photochemical method. These carbon dots showed potent antimicrobial photodynamic activity by producing Reactive Oxygen Species (ROS). It promoted tissue regeneration, enhanced angiogenesis and collagen formation achieved faster wound closure with superior tissue repair, highlighting its future applications in clinical wound care (Roy et al., 2024). This study synthesized resveratol -derived carbon dots via a one pot green synthesis method using resveratol with citric acid. They exhibit low cytotoxicity (up to 200 µg/mL), significantly enhanced cell proliferation migration, accelerated in vivo wound contraction, and achieved complete healing by day 14. Histological analysis reported enhanced repair, angiogenesis, re-epithelization and collagen deposition ensures their safety and it’s is applicable for biomedical implementations. In a study demonstrated the green synthesized nanoparticle through a single-step microwave -assisted approach using six medicinal plants showed excellent DPPH activity across tested concentrations, suggesting anti -oxidants capacity to mitigate oxidative stress, and potential for integration into topical formulations or wound dressings (Singh et al., 2024). The study synthesized the green synthesis of carbon dots from Bovine Serum Albumin (BSA) using a hydrothermal method resulting carbon dots showed high biocompatibility, low cytotoxicity and prospective antibacterial effects against wound pathogens including Streptococcus pyrogens, Staphylococcus aureus, and MRSA they demonstrates that when this carbon dots conjugated with antibiotic linezolid, they stimulated migration and proliferation and enhancing wound healing applications (Ghataty et al., 2023). This study reported carbon dots from resveratol and citric acid through one pot hydrothermal method results potent biocompatibility, antimicrobial and antioxidant properties. In vivo studies showed the promotion of wound healing through cell propagation, migration and angiogenesis, resulting as a novel wound healing application (Cheng et al., 2023). Thu et al., demonstrated CQDs/AgNPs composite from chitosan showed a synergistic antibacterial effect against the carbapenem - resistant Acinetobacter baumannii (Thu et al., 2023). This study developed curcumin loaded carbon nanospheres integrated with polyvinyl alcohol nanofibers derived from sandal wood bark via pyrolysis and electrospinning. The nanofibers fabrication showed excellent wound healing properties through its anti- microbial property. The synergistic effect of curcumin with PVA nanofiber, increase regeneration of wound tissue and potent wound healing efficacy and applicable for bio-based dressing as a novel therapeutic application. In another study (Biswal et al., 2023), fabricated chitosan films incorporated with f-MWCNT and nanotitania using concentrated nitric acid exhibited potent wound healing in both Drosophilia and rat models. Antibacterial assays confirmed antibiofilm activity compared to chitosan plate these findings promise the (CS/PVA@TiO2 /f-MWCNT) is effective for wound healing applications (Biswal et al., 2023). This study developed carbon nanoparticle from Piper longum, which exhibited potent antibacterial and antibiotic activity (Janaranjani et al., 2024). Shandilya et al., developed Biofib Gel using green -synthesized Curcuma longa -reduced Silver Nanoparticles (AgNPs) (1%) with 1% Carbon Dots (CDs). This solution demonstrated high water absorption capacity, anti-microbial activity, collagen deposition, fibroblast proliferation and tissue regeneration making it to advanced wound healing activity (Shandilya et al., 2021). A study developed Carbon Nanospheres (CNs) from Oil Palm Leaves (OPL) through pyrolysis loaded with curcumin, and integrated with chitosan membranes, The resulting CNs exhibited enhanced moisture -absorbing property, anti- bacterial activity-This synergistic effect of Carbon Nanosphere (CNs) and the chitosan scaffold accelerate tissue regeneration and wound healing. Overall, the green synthesis Carbon Nanosphere (CNs) -chitosan scaffold is suitable and effective for wound dressing applications (Velmurugan et al., 2022). This study developed silver-incorporated mesoporous carbon Nanoparticles (MCNs), resulting advanced and promising tool for wound healing process in both acute and chronic wounds (Torre et al., 2019). Bhatt et al., demonstrated Mesoporous Carbon Nanospheres (MCNs) derived from onion peel via pyrolysis. Toxicological profiling in animal model Drosophilia melanogaster for confirmed their non -toxic nature (Bhat et al., 2022). Drug loaded Carbon Nanotubes (CNTs) and their roles in tissue repair (Figure 3).
CONCLUSION
Biomass providing carbon reservoir, can be utilized for the green - synthesis of CNPs, providing eco-friendly, low cost, high scalable when comparing to chemical and physical synthesis. Biomass such as fruit peels, leaves extracts are excellent source for carbon are utilized to develop diverse varieties of CNPs such as (CDs, CNTs, CNSs, NDs) have been shown sustainable potential for biomedical fields. In Particular they play a crucial role in wound healing by enhancing cell propagation, migration and angiogenesis. However, the scalability and incorporation of carbon nanodiamonds in wound healing application is still limited. This review summarizes the simple production of CNPs and their roles in biomedical application, bridging them to advanced approaches in wound healing.
