Electrochromic devices using colorful metallic single‐wall carbon nanotube films are produced. The metallic SWCNTs act as both electrochromic components and electrodes, confirming a route to all carbon nanotube electrochromic devices.
Field‐effect transistors that employ an electrolyte in place of a gate dielectric layer can accumulate ultrahigh‐density carriers not only on a well‐defined channel (e.g., a two‐dimensional surface) but also on any irregularly shaped channel material. Here, on thin films of 95% pure metallic and semiconducting single‐walled carbon nanotubes (SWNTs), the Fermi level is continuously tuned over a very wide range, while their electronic transport and absorption spectra are simultaneously monitored. It is found that the conductivity of not only the semiconducting but also the metallic SWNT thin films steeply changes when the Fermi level reaches the edges of one‐dimensional subbands and that the conductivity is almost proportional to the number of subbands crossing the Fermi level, thereby exhibiting a one‐dimensional nature of transport even in a tangled network structure and at room temperature.
We report clear experimental evidence for the charge manipulation of molecules encapsulated inside single-wall carbon nanotubes (SWCNTs) using electrochemical doping techniques. We encapsulated -carotene (Car) inside SWCNTs and clarified electrochemical doping characteristics of their Raman spectra. C ¼ C streching modes of encapsulated Car and a G band of SWCNTs showed clearly different doping behaviors as the electrochemical potentials were shifted. Electron extraction from encapsulated Car was clearly achieved. However, electrochemical characteristics of Car inside SWCNTs and doping mechanisms elucidated by calculations based on density-functional theory indicate the difficulty of charge manipulation of molecules inside SWCNTs due to the presence of strong on-site Coulomb repulsion energy at the molecules.
H. Shimotani and co‐workers report the substantial changes in the conductance of a metallic SWNT thin film with an ionic‐liquid gating. On page 3305, number of current‐carrying subbands in metallic SWNTs as well as semiconducting SWNTs are electrochemically controlled and observed in situ with optical absorption spectrometer. The conductance of SWNT thin films shows stepwise increases when the number of current‐carrying subbands increases.
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