Polypyrrole Film Deposited-TiO2 Nanorod Arrays for High Performance Ultraviolet Photodetectors

Abstract

TiO2-based ultraviolet photodetectors have drawn great attention and are intensively explored. However, the construction of TiO2-based nanocomposites with excellent ultraviolet responses remains challenging. Herein, a TiO2 nanorod array was successfully prepared on fluorine-doped tin oxide (FTO) conductive glass by a one-step hydrothermal method. Then, polypyrrole (PPy)-TiO2 nanorod array composites were designed via subsequent in situ oxidative polymerization. The morphologies, structures, and photocurrent responses of the nanocomposites were systematically investigated. The results demonstrated that polypyrrole-TiO2 exhibited a stronger photocurrent response than pure TiO2 due to the p-n junction formed between n-type TiO2 nanorod arrays and p-type polypyrrole. The PPy-TiO2 composite obtained by deposition three times had the best photoelectric properties, exhibiting good performance with a sensitivity of 41.7 and responsivity of 3.5 × 10−3 A/W. Finally, the mechanism of the photoelectrical response of PPy-TiO2 composites was discussed, guiding the design of high-performance TiO2-based ultraviolet photodetectors.

All‐Organic Smart Textile Sensor for Deep‐Learning‐Assisted Multimodal Sensing

“…[29,30] 3) Tunable electrical properties for advanced applications. In previous literature, a series of devices with different electrical properties, such as highly conductive electrodes, [29][30][31] gas-sensitive, [32] temperature-sensitive, [33] and photosensitive functional layers, [34] have been fabricated by controlling the react conditions of PPY. This feature ensures that the temperature-sensitive layer and electrode can be collected from a single organic conductive material.…”