Photoelectrochemical sensor based on Bi2(Te1-xSex)3 for the sensitive detection of the tetracycline hydrochloride

Tetracycline hydrochloride (TC-HCl) as an antibiotic is widely used in our daily life, but it has posed potential threats to the ecological environment for flowing into the natural environment. To address this issue, The photoelectrochemical (PEC) sensor is first developed for the detection of TC-HCl by comparing and analyzing ternary Bi2(Te1-xSex)3 nanomaterials prepared through different ratios of hydrothermal methods. Specifically, the Bi2(Te1-xSex)3/Indium tin oxide (ITO) electrode can interact with TC-HCl rapidly and selectively which results in a significant reduction of the photocurrent signal. By regulating the ratio of x, it is found that Bi2Te2.85Se0.15/ITO have the best stability and the fastest response time in the detection of TC-HCl. The response/recovery speed of the sensor to TC-HCl is fast to 0.23 s, a low detection limit of 0.08 pmol/l (S/N = 3) and a linear detection fit of up to R2 = 0.992. Moreover, the sensor has good stability and specificity for TC-HCL detection, providing a new perspective for the development of PEC sensors

High performance surface plasmon enhanced ZnO-Pt @ AlN core shell UV photodetector synthesized by magnetron sputtering

ZnO, a potential optoelectronic material, is attracting significant attention in ultraviolet (UV) photodetectors. However, low photoelectric conversion efficiency is a shortcoming because of its surface defect. In this paper, a plasmonic enhanced high speed UV photodetector was fabricated by ZnO-Pt@AlN core shell nanowires arrays using chemical vapor deposition (CVD) and magnetron sputtering methods. As shown in experiment results, the core shell nanowire arrays exhibit 3.7 times enhancement of UV emission and inhibition of visible emission by surface defect. In addition, compared to the pure ZnO nanorod array detector, the introduction of Pt nanoparticles and AlN shell layer resulted in a device with faster rising and falling edges (from 5.67 s to 3.09 s; from 41.18 to 0.32 s) as well as higher bright-to-dark current ratio (from 6.6 to 310.5). As shown in simulation results, the optical field would be localized in the shell of ZnO nanorods, and the ZnO-Pt@AlN core–shell structure can effectively improve the absorption of 365 nm UV light. In one word, this paper employs two general methods to improve the optoelectronic performance of ZnO, and obtains plasmonic enhanced high speed UV photodetector fabricated by ZnO-Pt@AlN core shell nanowires array as well as the mechanism of enhancement is explained