Fabrication of a highly sensitive flexible humidity sensor based on Pt/polythiophene/reduced graphene oxide ternary nanocomposite films using a simple one-pot method

被引：37

作者：

Tsai, Meng-Shian ^{[1
]}

Su, Pi-Guey ^{[2
]}

Lu, Chia-Jung ^{[1
]}

机构：

[1] Natl Taiwan Normal Univ, Dept Chem, Taipei 116, Taiwan

[2] Chinese Culture Univ, Dept Chem, Taipei 111, Taiwan

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2020年 / 324卷 / 324期

关键词：

Flexible humidity sensor; polythiophene; Pt; reduced graphene oxide; nanocomposite; LAYER-BY-LAYER; SENSING PROPERTIES; THIN-FILM; FACILE FABRICATION; COMPENSATION; FLEXIBILITY; HYSTERESIS; SUBSTRATE; MECHANISM; SURFACE;

D O I：

10.1016/j.snb.2020.128728

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A novel, flexible humidity sensor based on ternary nanocomposite films of Pt nanoparticles, polythiophene, and reduced graphene oxide (Pt/polythiophene/RGO) was fabricated using a simple one-pot redox synthesis. First, 2-thiophene methanol (2-TPM) was allowed to react with PtCl42- ions via an oxidative polymerization process, which released electrons that simultaneously reduce the PtCl42- ions and GO to Pt nanoparticles and RGO, respectively. The effects of the amounts of added PtCl42- ions and RGO on the electrical, flexibility, and humidity-sensing properties of the Pt/polythiophene/RGO ternary nanocomposite films were investigated. The Pt/polythiophene/RGO ternary nanocomposite films were characterized by using the Fourier transform infrared spectroscopy (FTIR), Raman, atomic force microscopy (AFM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). A Pt/polythiophene/RGO ternary nanocomposite film containing 30 mg of Pt and 0.1 g of RGO exhibited the greatest flexibility, sensitivity, and long-term stability. This flexible humidity sensor also demonstrated a wide range of working humidities, an acceptable linearity, a small hysteresis, a short response/recovery time, and a weak temperature dependence. We used complex impedance spectra to explain the humidity-sensing mechanism of the flexible sensor based on Pt/polythiophene/RGO ternary nanocomposite films and thus found that the ions (H3O+) in this system dominate the conductance process of the sensor.

引用

页数：12