Exploiting Two‐Dimensional Bi₂O₂Se for Trace Oxygen Detection

Abstract

We exploit a high‐performing resistive‐type trace oxygen sensor based on 2D high‐mobility semiconducting Bi2O2Se nanoplates. Scanning tunneling microscopy combined with first‐principle calculations confirms an amorphous Se atomic layer formed on the surface of 2D Bi2O2Se exposed to oxygen, which contributes to larger specific surface area and abundant active adsorption sites. Such 2D Bi2O2Se oxygen sensors have remarkable oxygen‐adsorption induced variations of carrier density/mobility, and exhibit an ultrahigh sensitivity featuring minimum detection limit of 0.25 ppm, long‐term stability, high durativity, and wide‐range response to concentration up to 400 ppm at room temperature. 2D Bi2O2Se arrayed sensors integrated in parallel form are found to possess an oxygen detection minimum of sub‐0.25 ppm ascribed to an enhanced signal‐to‐noise ratio. These advanced sensor characteristics involving ease integration show 2D Bi2O2Se is an ideal candidate for trace oxygen detection.

Salt‐Assisted Low‐Temperature Growth of 2D Bi2O2Se with Controlled Thickness for Electronics

“…So far, 2D Bi 2 O 2 Se has been synthesized by various techniques, including molecular beam epitaxy (MBE), [32] pulsed laser deposition (PLD), [33] wet-chemical methods, [34][35][36][37] physical vapor deposition (PVD), [30] and CVD method. [25,28,[38][39][40][41][42][43] Among these growth strategies, Bi 2 O 2 Se attained by PLD or MBE requires expensive equipment and ultra-high vacuum. Currently, the large size and crystal quality of material synthesized with the wet-chemical method are huge challenges.…”

Self-Healing, Self-Adhesive and Stable Organohydrogel-Based Stretchable Oxygen Sensor with High Performance at Room Temperature

“…Specifically, the response and recovery time to 250 ppm O 2 are 182 and 1315 s, respectively [ 37 ]. Although Xu et al proposed the utilization of two-dimensional Bi 2 O 2 Se to detect O 2 with an extremely low concentration of 0.25 ppm, the sensor failed to display the flexibility/stretchability, linearity, and fast response speed [ 38 ]. In addition, some oxygen sensors based on new sensing materials also have limitations [ 39 , 40 ].…”

Out‐of‐Plane Resistance Switching of 2D Bi2O2Se at the Nanoscale

“…[7] In another work, gas sensors based on 2D Bi 2 O 2 Se show high selectivity and ultralow oxygen detection limit of 0.25 ppm at ambient temperature because of the easy trap of oxygen by the Se vacancies on the surface of Bi 2 O 2 Se. [8] Furthermore, electrical properties remains elusive, despite its significance in developing devices with new functionality and meeting the requirements of high integration density and compatibility. [24,25] Herein, we report unique out-of-plane electrical properties of 2D Bi 2 O 2 Se.…”