A high performance surface acoustic wave visible light sensor using novel materials: Bi2S3 nanobelts

Chong Li, Hao Kan, Jingting Luo, Chen Fu, Jian Zhou, Xueli Liu, Wen Wang, Qiuping Wei, Richard Fu

Research output: Contribution to journalArticlepeer-review

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Abstract

Low dimensional Bi2S3 materials are excellent for use in photodetectors with excellent stability and fast response time. In this work, we developed a visible light sensor with good performance based on surface acoustic wave (SAW) devices using Bi2S3 nanobelts as the sensing materials. The SAW delay-line sensor was fabricated on ST-cut quartz with a designed wavelength of 15.8 microns using conventional photolithography techniques. The measured center frequency was 200.02 MHz. The Bi2S3 nanobelts prepared by a facile hydrothermal process were deposited onto SAW sensors by spin-coating. Under irradiation of 625 nm visible light with a power intensity of 170 μW cm−2, the sensor showed a fast and large response with a frequency upshift of 7 kHz within 1 s. The upshift of the frequency of the SAW device is mainly attributed to the mass loading effect caused by the desorption of oxygen from the Bi2S3 nanobelts under visible light radiation.
Original languageEnglish
Pages (from-to)8936-8940
Number of pages5
JournalRSC Advances
Volume10
Issue number15
Early online date2 Mar 2020
DOIs
Publication statusE-pub ahead of print - 2 Mar 2020

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