Carbon Dots as Nanodispersants for Multiwalled Carbon
Nanotubes: Reduced Cytotoxicity and Metal Nanoparticle Functionalization
Version 2 2017-07-24, 12:13
Version 1 2017-07-24, 12:08
Posted on 2017-07-24 - 12:13
The colloidal stabilization
of multiwalled carbon nanotubes (MWCNTs)
in an aqueous medium through noncovalent interactions has potential
benefits toward the practical use of this one-dimensional carbonaceous
material for biomedical applications. Here, we report that fluorescent
carbon nanodots can efficiently function as dispersing agents in the
preparation of stable aqueous suspensions of CNTs at significant concentrations
(0.5 mg/mL). The amphiphilic nature of carbon dots with a hydrophobic
graphitic core could effectively interact with the CNT surface, whereas
hydrophilic oxygenated functionalization on the C-dot surface provided
excellent water dispersibility. The resultant CNT-C-dot composite
showed significantly reduced cytotoxicity compared to that of unmodified
or protein-coated CNTs, as demonstrated by cell viability and proliferation
assays. Furthermore, the reducing capability of C-dots could be envisaged
toward the formation of a catalytically active metal nanoparticle-CNT-C-dot
composite without the addition of any external reducing or stabilizing
agents that showed excellent catalytic activity toward the reduction
of p-nitrophenol in the presence of NaBH4. Overall, the present work establishes C-dots as an efficient stabilizer
for aqueous dispersions of CNTs, leading to an all-carbon nanocomposite
that can be useful for different practical applications.
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Mandani, Sonam; Majee, Prativa; Sharma, Bhagwati; Sarma, Daisy; Thakur, Neha; Nayak, Debasis; et al. (2017). Carbon Dots as Nanodispersants for Multiwalled Carbon
Nanotubes: Reduced Cytotoxicity and Metal Nanoparticle Functionalization. ACS Publications. Collection. https://doi.org/10.1021/acs.langmuir.7b00557
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AUTHORS (7)
SM
Sonam Mandani
PM
Prativa Majee
BS
Bhagwati Sharma
DS
Daisy Sarma
NT
Neha Thakur
DN
Debasis Nayak
TS
Tridib K. Sarma
KEYWORDS
oxygenated functionalizationcarbon nanodotsnoncovalent interactionsMWCNTNaBH 4C-dot surfacegraphitic coreprotein-coated CNTscarbon Dotsmultiwalled carbon nanotubeswater dispersibilitycarbon dotsmetal nanoparticle-CNT-C-dotCNT surfaceproliferation assaysReduced CytotoxicityMetal Nanoparticle FunctionalizationMultiwalled Carbon Nanotubescell viabilityagentapplicationall-carbon nanocompositecarbonaceous materialamphiphilic nature