Multifunctional hierarchical 3-D ZnO superstructures directly grown over FTO glass substrates: enhanced photovoltaic and selective sensing applications

Abstract

Ammonia has been extensively utilized in many applications such as agrochemicals, pharmaceuticals, organic dyes, synthetic fibres, and it can diffuse into the atmosphere and cause severe effects on human health as well as the environment.

Ultrasensitive NOX Detection in Simulated Exhaled Air: Enhanced Sensing via Alumina Modification of In‐Situ Grown WO3 Nanoblocks

“…Calibration of gas sensor was achieved by determining the change in current response as a function of time, without any analyte gas to minimize the contribution of factors neighboring to the sensor device as presented in Figure S4. These calibration curves were measured at a fixed bias voltage of + 3 V and the obtained current values at this bias for both bare and alumina modified WO 3 sensors were found to be comparable to that of current–voltage (I‐V) values obtained in Figure S3 …”

“…These calibration curves were measured at af ixed bias voltage of + 3Vand the obtained current values at this bias for both barea nd alumina modified WO 3 sensors were found to be comparable to that of current-voltage (I-V) values obtained in Figure S3. [38] Selectivity of chemoresistor devices wered etermined by injecting pre-mixed analyte gases, such as nitrogen, oxygen, carbon dioxide, argon along with water vapors (5 ppm), onto the Sensor device.F igure 7(A,B) show selectivity plots for bare and modified WO 3 based devices, while Figure 7(C,D) shows correspondingn ormalized current response bar diagram. After the exposure of 200 ppb of NO X ,t he change in currentr e-sponse is 84 mAa nd 349 mAf or WO 3 and modified WO 3 respectively as shown in Figure Ca nd D. In addition, NH 3 vapors (1 ppm), mixed with very low concentration of NO X gas (200 ppb), were exposed to the sensing device.…”

Surfactant-assisted microwave processing of ZnO particles: a simple way for designing the surface-to-bulk defect ratio and improving photo(electro)catalytic properties

“…To explain the effects of the surfactants, i.e. surface-to-bulk defects ratio on the photoresponse and charge transport phenomena, 90,91 Nyquist plots for the three ZnO photoanodes were recorded in dark and under illumination, at the potential of 1.5 V vs. SCE. The Nyquist plots display similar semicircles with different radii, Fig.…”

“…According to literature data, the higher frequency region semicircle is attributed to the charge transfers and recombination processes occurring at the electrode/electrolyte interface, while the medium frequency region semicircle is attributed to electrochemical processes occurring at the photoanode/redox electrolyte interface. 91 The diameters of the semicircles in the Nyquist plots signify the charge transfer kinetics at the electrode interface. 17 Therefore, to determine the diameter of the semicircles, it was necessary to t the Nyquist plots by an equivalent circuit.…”

Transforming Photocatalytic g‐C3N4/MoSe2 into a Direct Z‐Scheme System via Boron‐Doping: A Hybrid DFT Study

“…[3][4][5][6][7] Nevertheless, photocatalytic technique requires highly efficient, stable, low-cost and pollution-free photocatalysts. Many semiconductor photocatalysts, such as TiO 2 , [8,9] g-C 3 N 4 , [10] BiVO 4 , [11] ZnO [12] and MoSe 2 , [13] have been widely investigated by researchers. However, poor visible-light absorption, low separation efficiency of photo-induced carriers or weak electron conductivity greatly limits large-scale applications of these single-component photocatalysts.…”