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Suspended SnS 2 Layers by Light Assistance for Ultrasensitive Ammonia Detection at Room Temperature
Author(s) -
Chen Huawei,
Chen Yantao,
Zhang Heng,
Zhang David Wei,
Zhou Peng,
Huang Jia
Publication year - 2018
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201801035
Subject(s) - ammonia , materials science , molecule , selectivity , volume (thermodynamics) , excitation , analytical chemistry (journal) , optoelectronics , surface area to volume ratio , sensitivity (control systems) , chemical engineering , environmental chemistry , chemistry , organic chemistry , electronic engineering , thermodynamics , physics , electrical engineering , engineering , catalysis
2D materials are extensively studied as candidates for chemical sensors due to their large surface‐to‐volume‐ratio and the low working temperature. However, the performance of 2D material‐based sensors is limited when detecting ammonia, due to the weak binding between ammonia molecules and channel materials. Previous reports show sensitivity in the ppb range upon NO 2 exposure, and in ppm levels of ammonia under the same conditions. Compared with the traditional SnS 2 sensors, the demonstrated suspended devices with light excitation exhibit a higher sensitivity, a faster response, and recovery rate. At room temperature, the devices show obvious response to NH 3 vapor at a concentration as low as 20 ppb. High selectivity to ammonia over many other chemical gases is observed. Such arresting features originate from the suspended structure enhancing reaction area and the light excitation inducing increased charge density that facilitates the ammonia detection. The enhanced sensing performance demonstrates the superiority of the suspended structure with light assistance, and this method can be applied to other 2D material‐based sensors on optimizing their performance.