The suppression of electron (n-type) conduction observed in back-gated field effect transistors is the result an electrochemical charge transfer process to oxygen/water layer adsorbed on hydrophilic substrates. impact this phenomenon demonstrated with nanoscale and thin-film carbon nanotube transistors.

Abstract Quantitative description of reaction mechanisms in aqueous phase electrochemistry requires experimental characterization local water structure at the electrode/aqueous interface and its evolution with changing potential. Gaining such insight experimentally under electrochemical conditions is a formidable task. The potential‐dependent subpopulation interfacial one OH group pointing towards gold working electrode characterized using specific vibrational spectroscopy thin film cell....

High-purity semiconducting single-walled carbon nanotubes (sc-SWCNTs) are promising for portable and high-sensitivity gas sensors because of their excellent physical electrical properties. Here, we describe the synthesis a novel indigo-fluorene-based copolymer (PFIDBoc) that has been designed to selectively enrich sc-SWCNTs with purity (>99.9%) yet contain latent function in form tert-butoxy (t-BOC)-protected amine can be later revealed exploited dioxide (CO2) sensing. SWCNTs wrapped PFIDBoc...

Double-walled carbon nanotubes (DWNTs) present an original coaxial geometry in which the inner wall is naturally protected from environment by outer wall. Covalent functionalization introduced here as effective approach to investigate DWNT devices. Performed using aryldiazonium salt, reversible upon thermal annealing and occurs strictly at surface of wall, leaving essentially unaltered chemical bonding. Measurements on functionalized transistors show that electrical current carried provide...

Polymer characteristics influence the chiral selectivity and yield in enrichment of (7,6) from Signis SG76 toluene by various fluorene homopolymers copolymers. Fluorene such as poly(9,9-di-n-dodecylfluorene) (PFDD) copolymers with anthracene poly[(9,9-dihexylfluorenyl-2,7-diyl)-co-(9,10-anthracene)] (PFH-A) result high selectivities up to 67 72%, respectively. The is calculated optical absorption using a known extinction coefficient also evaluated Raman scattering photoluminescence...

Liquid-phase encapsulation of α-sexithiophene (6T) molecules inside individualized single-walled carbon nanotubes (SWCNTs) is investigated using Raman imaging and spectroscopy. By taking advantage the strong response this system, we probe isotherms at 30 115 °C a statistical ensemble SWCNTs deposited on oxidized silicon substrate. Two distinct sequential stages are observed: Stage 1 one-dimensional (1D) aggregation 6T aligned head-to-tail nanotube, stage 2 proceeds with assembly second row,...

The hydrated electron has fundamental and practical significance in radiation radical chemistry, catalysis, radiobiology. While its bulk properties have been extensively studied, behavior at solid/liquid interfaces is still unclear due to the lack of effective tools characterize this short-lived species between two condensed matter layers. In study, we develop a novel optoelectronic technique for characterization birth structural evolution solvated electrons metal/liquid interface with...

Dispersions of purely semiconducting single-walled carbon nanotubes (SWCNTs) have enabled solution-processed SWCNT networks as active layers in field-effect transistors (FETs) with high carrier mobilities and excellent on/off current ratios. Although reproducibility has improved recent years, reaching the level that is required for commercial large-scale processing remains a challenge. A key issue tendency SWCNTs to aggregate over time, resulting network inhomogeneities cause large device...

This work revisits the physics giving rise to carbon nanotube phonon bands in midinfrared. Our measurements of doped and undoped samples single-walled nanotubes Fourier transform infrared spectroscopy show that exhibit an asymmetric line shape their effective cross section is enhanced upon doping. We relate these observations electron-phonon coupling or, more specifically, a Fano resonance phenomenon. note dopant-induced intraband (not interband) continuum couples strongly modes, defects...

Nanoelectronic detection of ion-induced protein conformational changes with metal nanoparticle-decorated carbon nanotube FET.

Abstract Quantitative description of reaction mechanisms in aqueous phase electrochemistry requires experimental characterization local water structure at the electrode/aqueous interface and its evolution with changing potential. Gaining such insight experimentally under electrochemical conditions is a formidable task. The potential‐dependent subpopulation interfacial one OH group pointing towards gold working electrode characterized using specific vibrational spectroscopy thin film cell....

DNA/DNA hybridisation analysis was undertaken to resolve the phylogenetic relationships within chromosomally diverse genus Petrogale. Excepting P. concinna, all full species and three subspecies of lateralis were examined; but four these 16 taxa labeled, as outgroup species. While demonstrating ability technique at level, our study confirmed that divergence Petrogale is recent occurred during late Pliocene mid-Pleistocene. Our data placed first division between monophyletic brachyotis group...

The high sensitivity of carbon nanotube devices as gas sensors is generally attributed to the large surface area material, whereas selectivity often imparted by "lock-and-key" mechanism. In contrast with this picture, where little function conferred underlying substrate, we demonstrate that bottom gate network field-effect transistors (CNN-FETs) fabricated on a variety polymer dielectrics, but same pristine nanotubes, show differentiated responses analytes. Interaction environment thus...

Although carbon nanotube transistors present outstanding performances based on key metrics, large-scale uniformity and repeatability required in printable electronics depend greatly proper control of the electrostatic environment. Through a survey polymer dielectric encapsulants compatible with printing processes, simple correlation is found between measured interfacial charge density onset conduction transistor, providing rational route to electrical characteristics transistors. Smooth...

The lack of efficient optical components operating with terahertz (THz) radiation is a limiting step in the ongoing large-scale development this technology fields such as telecommunication and imaging. In work, we propose use double-walled carbon nanotube (DWCNT) films active electrode THz modulation devices. Using six bounces an internal total reflection configuration silicon waveguide prism, achieved high attenuation from 5 nm thin film, reaching up to −ΔT/T=6% at 50 THz, albeit slow speed...

We report anomalous antiresonances in the infrared spectra of doped and disordered single layer graphene. Measurements both reflection microscopy transmission configurations samples grafted with halogenophenyl moieties are presented. Asymmetric transparency windows at energies corresponding to phonon modes near Γ K points observed, contrast featureless spectrum pristine These asymmetric demonstrated vary as a function chemical potential defect density. propose model that involves coherent...

Quantitative description of reaction mechanisms in aqueous phase electrochemistry requires experimental characterization local water structure at the electrode/aqueous interface and its evolution with changing potential. Gaining such insight experimentally under electrochemical conditions is a formidable task. Here we characterize potential dependent sub-population interfacial that have one OH group pointing towards gold working electrode using specific vibrational spectroscopy thin film...

Carbon nanotubes come in different species having properties. So, it is useful to develop automated ways quantify purities and trace impurity content. Spatially scanned Raman spectra make hyperspectral data sets that can be used discriminate between determine purities, their analysis automated. A promising analytical machine learning approach non-negative matrix factorization, which a multivariate algorithm well adapted scattering sets, and, significantly, available open source. We prepare...

Single-walled carbon nanotubes (SWCNTs) are candidate matrices for loading metal nanoparticles (NPs) sensor and catalytic applications owing to their high electron conductivity mechanical strength, larger surface area, excellent chemical stability, ease of modification. The performance the formed NP/SWCNT composites is dependent on NP size, physical interactions between components, charge transfer capabilities. Anchoring complexes onto SWCNTs through noncovalent a viable strategy achieving...

Abstract not Available.

The chemical purity of materials is important for semiconductors, including the carbon nanotube material system, which emerging in semiconductor applications. One approach to get statistically meaningful abundances and/or concentrations measure a large number small samples. Automated multivariate classification algorithms can be used draw conclusions from such data sets. Here, we use spatially-mapped Raman spectra mixtures chirality-sorted single walled nanotubes dispersed sparsely on flat...