posted on 2023-11-29, 18:34authored byYuehong Yang, Boyang Zong, Qikun Xu, Qiuju Li, Zhuo Li, Shun Mao
Two-dimensional
violet phosphorus (VP) has emerged as a new sensing
material in various sensing applications due to its unique electrical
properties and high stability among allotropes of phosphorus. Currently,
the research of the VP-based analysis method is at the early stage.
In this work, a VP nanosheet-based field-effect transistor (FET) sensor
is reported for the detection of NO2 and N2O
gases with extraordinary sensing performance. This sensor can achieve
excellent sensitivity of up to ∼50% current change/ppm and
a low detection limit of 5.9 ppb and enables the NO2 analysis
in various mixed gases. Moreover, this sensor can effectively distinguish
between NO2 and N2O gases, which is a big challenge
for current FET or chemiresistor gas sensors. The different sensing
behaviors of the VP sensor to NO2 and N2O gases
have been investigated, and the mechanism study shows that the adsorption
energy, bond length of the gas molecule on the VP surface, and the
decomposition of N2O led to the differential responses.
This work is one of the pioneer studies of VP gas sensors and presents
a new sensing method for the discriminative analysis of NO2 and N2O for greenhouse gas emission monitoring and air
quality control.