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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...
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