pyrolytic method for the synthesis of carbon dots by chemical unzipping of epoxyenriched polystyrene photonic crystal.
Liu et al. (2009) reported novel route for the synthesis of nanosized carbon dots
typically 1.5–2.5 nm. The preparation method includes polymerization, pyrolysis,
oxidation, and surface passivation as illustrated in Scheme 3.6. Firstly, SiO 2 suspension was added to the aqueous solution amphiphilic triblock copolymer, and the
sample was stirred overnight. Here, resols (i.e., phenol/formaldehyde resins) are
used as carbon source. Further, high-temperature treatment removes silica carrier
and generated nanosized carbon dots. Here, the surfactant-modified silica is utilized
as carrier, anchors resols during polymerization, and also prevents aggregation of
carbon dots during pyrolysis.
The surface-functionalized carbogenic nanoparticles with size less than 10 nm
can be synthesized by thermal dissipation or by 4-aminoantipyrine route (Bourlinos
et al. 2008). The organophilic nanoparticles were prepared by citrate route while,
carbonization of 2-(2-aminoethoxy)-ethanol in another route prepare hydrophilic
nanoparticles. In both these methods, amide linkage (–NH–CO–) ties the organic
moiety to the core, and the precursor was pyrolyzed at 300
C for 2 h. Wang et al.
(2010) synthesize oil-soluble carbon dots by carbonization of carbon precursor and
water-soluble carbon dots by simply altering the solvent and capping reagent. For
oil-soluble carbon dot preparation, octadecane was used as the non-coordinating
solvent, 1-hexadecylamine as the capping agent, and citric acid as the carbon source.
The mixture of octadecane and 1-hexadecylamine was heated up to 300
C under
Scheme 3.6 Processing diagram for the synthesis of multicolor photoluminescent carbon dots by
polymerization, pyrolysis, oxidation, and surface passivation. Resols were used as carbon source.
(Reprinted with permission from Liu et al. (2009) copyright@2009, Wiley-VCH Verlag GmbH &
Co. KGaA, Weinheim)
100
P. Shandilya et al.
Liu et al. (2009) reported novel route for the synthesis of nanosized carbon dots
typically 1.5–2.5 nm. The preparation method includes polymerization, pyrolysis,
oxidation, and surface passivation as illustrated in Scheme 3.6. Firstly, SiO 2 suspension was added to the aqueous solution amphiphilic triblock copolymer, and the
sample was stirred overnight. Here, resols (i.e., phenol/formaldehyde resins) are
used as carbon source. Further, high-temperature treatment removes silica carrier
and generated nanosized carbon dots. Here, the surfactant-modified silica is utilized
as carrier, anchors resols during polymerization, and also prevents aggregation of
carbon dots during pyrolysis.
The surface-functionalized carbogenic nanoparticles with size less than 10 nm
can be synthesized by thermal dissipation or by 4-aminoantipyrine route (Bourlinos
et al. 2008). The organophilic nanoparticles were prepared by citrate route while,
carbonization of 2-(2-aminoethoxy)-ethanol in another route prepare hydrophilic
nanoparticles. In both these methods, amide linkage (–NH–CO–) ties the organic
moiety to the core, and the precursor was pyrolyzed at 300
C for 2 h. Wang et al.
(2010) synthesize oil-soluble carbon dots by carbonization of carbon precursor and
water-soluble carbon dots by simply altering the solvent and capping reagent. For
oil-soluble carbon dot preparation, octadecane was used as the non-coordinating
solvent, 1-hexadecylamine as the capping agent, and citric acid as the carbon source.
The mixture of octadecane and 1-hexadecylamine was heated up to 300
C under
Scheme 3.6 Processing diagram for the synthesis of multicolor photoluminescent carbon dots by
polymerization, pyrolysis, oxidation, and surface passivation. Resols were used as carbon source.
(Reprinted with permission from Liu et al. (2009) copyright@2009, Wiley-VCH Verlag GmbH &
Co. KGaA, Weinheim)
100
P. Shandilya et al.