Tin Disulfide-Coated Microfiber for Humidity Sensing with Fast Response and High Sensitivity

Abstract

Breath monitoring is significant in assessing human body conditions, such as cardiac and pulmonary symptoms. Optical fiber-based sensors have attracted much attention since they are immune to electromagnetic radiation, thus are safe for patients. Here, a microfiber (MF) humidity sensor is fabricated by coating tin disulfide (SnS2) nanosheets onto the surface of MF. The small diameter (~8 μm) and the long length (~5 mm) of the MF promise strong interaction between guiding light and SnS2. Thus, a small variation in the relative humidity (RH) will lead to a large change in optical transmitted power. A high RH sensitivity of 0.57 dB/%RH is therefore achieved. The response and recovery times are estimated to be 0.08 and 0.28 s, respectively. The high sensitivity and fast response speed enable our SnS2-MF sensor to monitor human breath in real time.

Dye-Modified, Sonochemically Obtained Nano-SnS2 as an Efficient Photocatalyst for Metanil Yellow Removal

“…The first structural report on tin(IV) sulphide is almost 100 years old; however, it is a very interesting and useful material according to many studies [1]. It is continuously investigated in a wide spectrum of practical applications, amongst which the most recent for standalone, composite, or combined in heterostructure SnS 2 include electrocatalysis, gas sensors, humidity sensing, energy storage, and Li-ion batteries, solid-state extraction of antibiotics, photodetectors, and photocatalysis [2][3][4][5][6][7][8][9]. Tin selenides (SnSe, SnSe 2 ), which are closely related to tin sulphides (SnS, SnS 2 ), have many similar applications as well [10].…”