“Writing–Reading–Erasing” on Tungsten Oxide Films Using the Scanning Electrochemical Microscope

Abstract

ExperimentalPreparation of Polymers 3 and 4: 3 and 4 were prepared by transition metal catalyzed ROP of [1]silaferrocenophane monomers according to wellknown procedures [5]. Molecular weights were estimated by gel permeation chromatography (GPC) calibrated to polystyrene standards. For 3: M w = 4.3´10 5 , Polydispersity Index (PDI) = 1.9. For 4: M w = 2.9´10 5 , PDI = 1.6.Preparation of Devices: Devices based on 3 and 4 were prepared by coating a 50 mm thick Mylar film with 1.5 mL of a 15 wt.-% solution of 3 or 4 in toluene. Film applications were accomplished with the use of a motor-driven blade applicator (designed and built in-house) using a stainless steel blade (Paul N. Gardiner Company) with a 0.25 mm slit opening driven at a constant linear velocity of 1 cm s ±1 . Mylar films (type A Mylar, Dupont) were purchased from Cadillac Plastics.Arc Discharge Simulations: Films of 3 and 4 supported on Mylar were placed underneath a copper mask possessing a 4.5 cm diameter circular aperture. The electron beam was generated using a modified SEM operating at variable filament currents. Discharge images were captured with a Tektronix model C1002 CCD video camera, which is fed into a Sony model EVO-9800 Hi8 videocassette recorder. Discharge current pulses were measured using a Tektronix model 72 500 transient digitizing oscilloscope.

Effect of growth time on structural, morphological and electrical properties of tungsten oxide nanowire

“…High coloration tungsten oxide nanowires have attracted lots of attention, due to their potential in pH sensing, water splitting, gas sensors, n-type semiconductor, photocatalytic and field emission [6][7][8][9]. Hence tungsten oxide nanowires (NWs) have been synthesized by numerous synthetic approaches such as thermal evaporation, chemical vapor deposition (CVD), solvothermal route and electro spinning method for their electric or electrochemical applications [9][10][11][12]. Liu et al [13] reported on the preparation of tungsten oxide nanowires through a vapor-solid growth process by heating a tungsten wire partially wrapped with boron oxide at 1200 °C.…”

Synthesis and characterization of tungstite (WO3·H2O) nanoleaves and nanoribbons

“…A simple heat-treatment of tungstite (WO 3 .H 2 O) allows for the phase transformation to tungsten oxide (WO 3 ), an important class of n-type semiconductors with a tunable band gap of 2.5-2.8 eV [16]. Moreover, its high chemical stability, low production costs and non-toxicity have recently generated significant interests for a wide variety of applications in microelectronics and optoelectronics [17][18], super-hydrophilic thin films [15], dye-sensitized solar cells [19], colloidal quantum dot LEDs [20], photocatalysis [21] and photoelectrocatalysis [22], water splitting photocatalyst as main catalyst [23][24][25][26][27][28][29][30][31][32][33][34]. Environmental applications can also benefit from WO 3 as a visible light photocatalyst to generate OH radicals for bacteria destruction [35] and photocatalytic reduction of CO 2 into hydrocarbon fuels [36].…”

Tungsten Oxide Nanopowders and Nanorods Prepared by a Modified Plasma Arc Gas Condensation Technique

“…Over past decades, transition metal oxides (TMOs) have been widely investigated for use in applications related to electrochromism, 1) optics, 2) catalysts, 3) and gas sensors. 4) Among these TMOs, tungsten oxide (WO 3 ) is a promising candidate for the above mentioned applications.…”