Carbon‐Based Sensors

Li, Jun

doi:10.1002/9780470403709.ch14

Cited by 2 publications

(2 citation statements)

References 85 publications

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“…Carbon nanotubes (NT) are almost exclusively composed of sp 2 -bonded carbon atoms, and can be classified as single- and multiwalled carbon nanotubes (SWNT and MWNT) . The conductivity of NT is very much dependent on their structural characteristics . SWNT are formed by wrapping a single sheet of graphene, their conductivity depends on their chirality (helicity) and diameter, and may lead to behave as semiconductors or as 1D nanowires.…”

Section: Introductionmentioning

confidence: 99%

Photolysis of Phenylalanine in the Presence of Oxidized Carbon Nanotubes

Humeres¹,

Souza²,

Debacher³

et al. 2014

Langmuir

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Photolyses at 254 nm of phenylalanine (Phe) in aqueous solutions, were carried out in the presence of oxidized carbon nanotubes modified by the reaction with SO2 (mNTO). Kinetics of the photolyses were followed by UV spectrophotometry at 220 nm, and the products were characterized by HPLC, XPS, and (13)C-SSNMR. The ratio of the initial rates of photolysis in the presence and absence of mNTO, k*/ko*, showed a systematic decrease. The photolytic decay of Phe occurs with minor formation of tyrosine. The mass of nanotubes produced an exponential attenuation of the photolytic decomposition of Phe. Total carbon analyses (TCA) showed no inorganic carbon formation after the photolyses. The first-order rate constant of photofunctionalization of mNTO by the insertion of phenylalanine onto the nanotube matrix was calculated from TCA to be kin = 30.1 min(-1). Comparison of the XPS spectra of the mNTO before and after the photolysis, using the atom inventory technique, suggests the insertion of Phe along with the extrusion of a sulfide radical anion ((•)S(-)) which undergo subsequent oxidation to SO4(2-). The obtained results show the effects of mNTO on the photolysis of Phe and provide a new method of photofunctionalization of carbon materials, modified by the intermediates of the reduction of SO2, with an organic moiety.

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Section: Introductionmentioning

confidence: 99%

Photolysis of Phenylalanine in the Presence of Oxidized Carbon Nanotubes

Humeres¹,

Souza²,

Debacher³

et al. 2014

Langmuir

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show abstract

“…Carbon based materials have shown great promise in these elds, prompting numerous experimental and theoretical studies. 1,2 However, the mechanisms involved in hydrogen attachment to carbon materials and the effects of hydrogen attachment on the structural/electrical properties of the carbon materials are not yet fully understood.…”

Section: Introductionmentioning

confidence: 99%