Ammonia Gas Sensor Using Polypyrrole-Coated TiO2/ZnO Nanofibers

✍ Scribed by Ying Wang; Wenzhao Jia; Timothy Strout; Ashely Schempf; Heng Zhang; Baikun Li; Junhong Cui; Yu Lei

• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 423 KB
• Volume: 21
• Category: Article
• ISSN: 1040-0397
• DOI: 10.1002/elan.200904584

✦ Synopsis

Highly porous polypyrrole (PPy)-coated TiO 2 /ZnO nanofibrous mat has been successfully synthesized. The core TiO 2 / ZnO nanofibers have an average diameter of ca. 100 nm and the shell of ultrathin PPy layer has a thickness of ca. 7 nm. The NH 3 gas sensor using the as-prepared material exhibited a fast response over a wide dynamic range and high sensitivity with a detection limit of 60 ppb (S/N ¼ 3). Compared to conventional pristine PPy film, the improved performance in NH 3 detection can be attributed to the free access of NH 3 to PPy and a minimized gas diffusion resistance through the ultrathin PPy layer.