Spectro-electrochemical studies of single wall carbon nanotubes films

Cório, Paola; Jório, Ado; Demir, Nasser; Dresselhaus, M. S.

doi:10.1016/j.cplett.2004.05.050

Cited by 91 publications

(107 citation statements)

References 12 publications

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“…Similar shifts in the Raman bands under the influence of electric fields has been observed in ferroelectrics [11]. In contrast, electrochemical Raman measurements of SWNT electrodes in aqueous environments [12] resulted in upshifts of the G-bands, which clearly points to differences between our and such experiments. It is tempting to assign the observed downshifts to a voltage-induced increase in phonon temperature (T) of the SWNTs.…”

supporting

confidence: 58%

Voltage-Induced Dependence of Raman-Active Modes in Single-Wall Carbon Nanotube Thin Films

2007

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supporting

confidence: 58%

Voltage-Induced Dependence of Raman-Active Modes in Single-Wall Carbon Nanotube Thin Films

2007

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“…High-level doping effects could also be assessed in carbon nanotubes, as summarized in 2003 for chemical doping by Filho et al [40], and in 2004 for electrochemical doping by Corio et al [41]. As demonstrated later, understanding low-doping effects had to wait for the introduction of new concepts.…”

Section: Historical Development Of Raman Spectroscopy Applied To Sp 2mentioning

confidence: 99%

Raman Spectroscopy in Graphene-Based Systems: Prototypes for Nanoscience and Nanometrology

Jório

2012

ISRN Nanotechnology

141

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Raman spectroscopy is a powerful tool to characterize the different types of sp 2 carbon nanostructures, including two-dimensional graphene, one-dimensional nanotubes, and the effect of disorder in their structures. This work discusses why sp 2 nanocarbons can be considered as prototype materials for the development of nanoscience and nanometrology. The sp 2 nanocarbon structures are quickly introduced, followed by a discussion on how this field evolved in the past decades. In sequence, their rather rich Raman spectra composed of many peaks induced by single-and multiple-resonance effects are introduced. The properties of the main Raman peaks are then described, including their dependence on both materials structure and external factors, like temperature, pressure, doping, and environmental effects. Recent applications that are pushing the technique limits, such as multitechnique approach and in situ nanomanipulation, are highlighted, ending with some challenges for new developments in this field.

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“…a) and c) PL spectra excited at 650 nm, in which signals for (7,5), (7,6), and (10,3) SWNTs appear. b) and d) PL spectra excited at 802 nm, in which signals for (12,1), (11,3), (10,5), and (9,7) SWNTs appear. In this experiment, the potential was applied to the electrode from 0.0 V to À1.0 V (a and b) and from 0.0 V to + 1.1 V (c and d).…”

mentioning

confidence: 98%

“…We carried out in situ near-IR PL spectroelectrochemistry in a way similar to the in situ near-IR absorbance spectroelectrochemistry method described above. As typical examples, in Figure 2, we show the PL spectra of the SWNTs having (7,5), (7,6), (10,3), (12,1), (11,3), (10,5), and (9,7) chirality indices at applied potentials from 0.0 to À1.0 V and then from 0.0 to + 1.1 V (for the other eight SWNTs with chirality indices of (6,5), (8,3), (8,4), (10,2), (9,4), (9,5), (8,6), and (8,7), see Figures S3 and S4 in the Supporting Information). It is evident that the PL spectra show a strong dependence on the applied potential.…”

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confidence: 99%

Experimentally Determined Redox Potentials of Individual (n,m) Single‐Walled Carbon Nanotubes

et al. 2009

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Ever since the discovery of carbon nanotubes (CNTs), many groups have endeavored to understand the fundamental properties of the CNTs. The redox properties (i.e. electronic densities, the Fermi levels, redox potentials) of single-walled carbon nanotubes (SWNTs) are related to the structures of SWNTs that have a specified diameter and chirality angle uniquely related to a pair of integers (n,m); the so-called chiral indices. [1,2] Many attempts have been made to determine the electronic properties of SWNTs using scanning tunneling spectroscopy, [3] redox titrimetry, [4] photoluminescence (PL) measurements, [5][6][7] and spectroelectrochemistry; [8][9][10][11][12][13] however, the success in the determination of the redox properties as already reported has been low. Recently, Paolucci et al. [12] employed Vis-near-IR absorption spectroelectrochemistry to estimate the redox potentials of the SWNTs dissolved in an ultradry dimethylsulfoxide (DMSO) solution; however, it is not easy to determine the redox potentials of isolated (n,m)SWNTs using this method because SWNTs with several different chiral indices have band gaps in the near-IR region that overlap one another. We now describe a simple method for the determination of the redox potentials of many (in this study, fifteen) individual (n,m)SWNTs using near-IR PL spectroelectrochemistry in an aqueous medium.Strategic approaches toward the solubilization of CNTs are essential for many applications of CNTs [14] and numerous dispersants including carboxymethylcellulose sodium salt (CMC, Figure S1a in the Supporting Information) [15] have been used to individually dissolve SWNTs. In this study, we fabricated a non-fluorescent transparent indium tin oxide (ITO) electrode modified with a cast film of CMC/poly-(diallyldimethylammonium chloride) (PDDA; Figure S1b in the Supporting Information) that contained isolated SWNTs (for details, see Experimental Section in the Supporting Information).We have discovered that we can determine the redox potentials of isolated SWNTs having their own chirality indices by in situ near-IR PL spectroelectrochemistry at the fabricated modified ITO electrode. This modified film retains the isolated SWNTs and the spectroelectrochemical results are analyzed with the Nernst equation.Externally applied potentials were changed in the range of ) and oxidized form (SWNT n+ ) when the external potential was applied to the electrode in arbitrary steps from 0.0 V to À1.0 V and from 0.0 V to + 1.1 V, respectively. After each potential step, the applied potential was returned to 0.0 V and it was confirmed that no significant spectral change in the SWNT had occurred, namely, the SWNTs in the film are stable during these electrochemically driven redox processes. This behavior of the SWNTs is consistent with those in Visnear-IR absorption [8b] and Raman [10b] spectroelectrochemical studies.We carried out in situ near-IR absorption spectroelectrochemistry using the modified electrode. The near-IR absorption spectra of the individually solubilized SWNTs wer...

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Spectro-electrochemical studies of single wall carbon nanotubes films

Cited by 91 publications

References 12 publications

Voltage-Induced Dependence of Raman-Active Modes in Single-Wall Carbon Nanotube Thin Films

Voltage-Induced Dependence of Raman-Active Modes in Single-Wall Carbon Nanotube Thin Films

Raman Spectroscopy in Graphene-Based Systems: Prototypes for Nanoscience and Nanometrology

Experimentally Determined Redox Potentials of Individual (n,m) Single‐Walled Carbon Nanotubes

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