Dongna Zou,Ruxangul Jamal,Tursun Abdiryim,Lielie Liu,Haile Liu,Nana Fan
Here, the ZnO-NRs/poly(EDOT-Pyridine-EDOT) core/shell heterostructure nanoarrays was prepared by the electrochemical polymerization of D-A-D type monomer (the 3,4-ethylenedioxythiophene(EDOT, donor) endcapped trimer with the pyridine(acceptor) as internal unit) on ZnO-NRs. This core/shell heterostructure nanoarrays was combined with ZnO-NRs to form p-n heterojunction for UV photodetector by face to face clamping of the two electrodes (ZnO-NRs/poly(EDOT-Pyridine-EDOT) and ZnO-NRs). The current-voltage and current-time curves under bias voltages of 1–6 V were tested, and the photoresponses of heterojunctions and bias voltages to UV light irradiation were systematically studied. The results showed that the poly(EDOT-Pyridine-EDOT) (poly(BPE)) uniformly covered ZnO-NRs and formed a core-shell structure, which was beneficial to increase the contact area between ZnO-NRs and poly(BPE). The ZnO-NRs/poly(BPE) heterojunction effectively improved the response performance of the UV photodetector and exhibited the highest photoresponsivity under 5 V bias voltage. The responsivity (R), detectivity (D*) and external quantum efficiency (EQE) were 150.87 A/W, 2.18 × 10 12 Jones and 51,351.5 %, respectively.
In order to obtain a high photoelectrochemical performance, co-catalysts loading is the most commonly used way, which can facilitate reactions and suppress the charge recombination. In this paper, a novel composite of ZnO/Ti 3 C 2 T X photoanode was fabricated by a facile spin coating of precipitating Ti 3 C 2 T X (MXene) flakes onto the surface of ZnO, as co-catalyst for enhanced photoelectrochemical (PEC) water splitting. Under simulated sunlight, the optimum composite of ZnO/Ti 3 C 2 T X photoanode showed the photocurrent density as 1.2 mA cm −2 at 1.23 V RHE , which is 1.4 times higher than that of pristine ZnO without Ti 3 C 2 T X co-catalyst (0.83 mA cm −2 at 1.23 V RHE ). The ZnO/Ti 3 C 2 T X photoanode showed a photoconversion efficiency of 0.32% and maintained a stable photocurrent over 2000s. The Ti 3 C 2 T X (MXene) flakes as co-catalyst to promote the charge transfer and accelerates the reaction kinetics in ZnO/Ti 3 C 2 T X photoanode. This work delivers a two-dimensional (2D) material Ti 3 C 2 T X (MXene) as co-catalyst for enhanced ZnO photoanode PEC water splitting.
As one of the most promising “next generation” alcohol fuels, n-pentanol brings convenience to our lives as well as challenges. Realizing real-time monitoring of n-pentanol is important to the health of workers in chemical plants. In this work, a series of Au nanoparticles functionalized ZnO nanorods were prepared by a facile one-step solvothermal method. The electronic sensitization and chemical sensitization of Au nanoparticles regulate the thickness of initial depletion layer of ZnO nanorods and increase the amount of adsorbed oxygen species on the surface. The gas-sensing results showed that 2 mol% Au nanoparticles functionalized ZnO nanorods exhibited the highest response of 71.8 to 4 ppm n-pentanol at 260 °C, and showed much higher response than other various saturated monohydric alcohols with different carbon chain lengths. Moreover, the sensor possessed ultra-fast response speed (1 s), excellent stability, and a certain ability of moisture resistance. The sensor was heated at 350 °C to promote the desorption of n-pentanol. The surface depletion layer model and energy band theory were used to explain the enhanced gas-sensing performance. This work provides a suitable candidate for real-time monitoring of n-pentanol in chemical plants.
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