A metal layer, used as a current collector layer for a textile-based supercapacitor (SC), was prepared on polyethylene terephthalate (PET) fabrics using wet chemical methods. By integrating this additional current collector layer into the SC structure, the carbon-nanotube (CNT)-based SC showed an improved capacitive performance. The specific capacitances of the CNT/Cu/PET SC and CNT/Au/PET SC were 4.312 Â 10 À3 F cm À2 and 3.683 Â 10 À3 F cm À2 respectively, about 60 times larger than that obtained from the CNT/PET SC without the metal collector layer. On the other hand, the energy densities of these CNT-based SCs with metal layers were found to be $50 fold increased as compared to the CNT/ PET SC. Similarly, the power densities of these two SCs with current collector layers were two orders of magnitude larger than that of CNT/PET SC. High flexibility was also demonstrated in these two metallayered SCs. For the durability measurement, the CNT/Au/PET SC showed a stable performance, with its specific capacitance maintained at about 89% of its initial value after 2500 charge-discharge cycles.However, the CNT/Cu/PET SC only showed a relatively short-term stability, as its specific capacitance dropped to 12% of its initial value after 2500 charge-discharge cycles. In order to further improve its capacitive performance, polyaniline (PANI) was deposited on the CNT/Au/PET SC surface using a cyclic voltammetric deposition method. A specific capacitance of 0.103 F cm À2 , about 30 times larger than that of the CNT/Au/PET SC, was obtained in the PANI/CNT/Au/PET SC which also showed good flexibility as well as high stability performance, with only 11% drop after 2500 charge-discharge cycles.On the basis of our results, we believe that by integrating a thin current collector layer into the textilebased CNT SC, its specific capacitance is enhanced while its flexibility and durability can be maintained.This method allows us to make any non-conducting fabric into a SC and turn it into a portable and wearable energy storage device.

Many applications of Sn-doped indium oxide (ITO) films in organic electronics require appropriate surface modifications of ITO nanocrystals with small organic molecules, such as silanes, phosophonic acids and carboxylic acids, to improve interfacial contacts and charge transfer. Here, we propose a new surface modification strategy via adsorption of acetylene molecules on an oxygen-terminated ITO(100) surface using a slab crystalline model to represent the nanocrystal surface. The adsorption was first studied using density functional theory. It was found that the chemisorption of C2H2 on two types of surface oxygen dimers is highly exothermic with the calculated adsorption energies of 3.80 eV and 5.19 eV, respectively. Electron population analysis reveals the origin of the strong interaction between the adsorbate and the ITO(100) surface. Experimental studies on the synthesized ITO nanocrystals using X-ray photoelectron spectroscopy and diffuse reflectance infrared Fourier transform spectroscopy confirm the predicted strong adsorption of C2H2 on ITO surfaces.