SnTe/SnSe Heterojunction Based Ammonia Sensors with Excellent Withstand to Ambient Humidities.
Xinlei LiShupeng SunNan WangBaoyu HuangXiaogan LiPublished in: Small (Weinheim an der Bergstrasse, Germany) (2023)
Non-invasive breath testing has gained increasing importance for early disease screening, spurring research into cheap sensors for detecting trace biomarkers such as ammonia. However, real-life deployment of ammonia sensors remains hindered by susceptibility to humidity-induced interference. The SnTe/SnSe heterojunction-based chemiresistive-type sensor demonstrates an excellent response/recovery to different concentrations of ammonia from 0.1 to 100 ppm at room temperature. The improved sensing properties of the heterojunctions-based sensors compared to single-phased SnTe or SnSe can be attributed to the stronger NH 3 adsorptions, more Te vacancies, and hydrophobic surface induced by the formed SnTe/SnSe heterojunctions. The sensing mechanisms are investigated in detail by using in situ techniques such as diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS), Kelvin probe, and a.c. impedance spectroscopy together with the Density-Function-Theory calculations. The formed heterojunctions boost the overall charge transfer efficiency between the ammonia and the sensing materials, thus leading to the desirable sensing features as well, with excellent resistance to ambient humidities.
Keyphrases
- room temperature
- ionic liquid
- low cost
- air pollution
- particulate matter
- anaerobic digestion
- magnetic resonance imaging
- solar cells
- high resolution
- high glucose
- molecular dynamics
- heavy metals
- risk assessment
- living cells
- endothelial cells
- low grade
- magnetic resonance
- perovskite solar cells
- mass spectrometry
- drug induced