Dual engineering of helical SnO2 nanostructures and Co2+/Co3+ valence state for ultra-selective acetone detection

Acetone (CH 3 COCH 3 ) is a key biomarker for non-invasive diagnosis and real-time monitoring of diabetes mellitus, motivating the development of sensing platforms capable of highly sensitive, selective, and humidity-robust detection. Here, we report Co 3 O 4 -decorated SnO 2 nanohelices (CSNHs) synthesized via sequential glancing-angle deposition (GLAD) as a structurally and electronically engineered framework for high-performance acetone sensing. The optimized 2-nm-thick CSNHs achieve an ultrahigh response of 859.8 to 50 ppm acetone at 350 °C—an 8-fold enhancement over pristine SnO 2 nanohelices—along with excellent repeatability (coefficient of variation, CV ≤ 5%) and ultralow theoretical detection limits…

• NR
  National Research Foundation of Korea