Author(s): Zhang, R (Zhang, Rui); Liu, CQ (Liu, Chuanqun); Wang, P (Wang, Pu); Li, Y (Li, Yang); Su, Y (Su, Yue); Dai, JX (Dai, Jianxun)

Source: ANALYST DOI: 10.1039/d2an01796b Early Access Date: DEC 2022

Abstract: Formaldehyde (HCHO) is regarded as one kind of indoor pollutant. Additionally, HCHO serves as a biomarker in the exhaled breath of breast cancer patients. Early warning and management are crucial for the environment and human health. Thus, we have elaborately synthesized hematite (alpha-Fe2O3) employing a facet-engineering hydrothermal strategy using the fine-tuned solvent composition, with special attention to the effect of different exposed surfaces on HCHO detection. The spindle-like alpha-Fe2O3 nanocrystals with the (012) facet exposed exhibited impressively higher response towards HCHO at room temperature than that of the disk-like alpha-Fe2O3 with mainly the (001) facet exposed, partly due to the abundant vacancy oxygen and adsorbed oxygen of high-index facets of alpha-Fe2O3. More importantly, our experimental results coincide with theoretical calculations. Overall, the surface engineering strategy could be extended to a versatile approach for HCHO detection.

Accession Number: WOS:000894137100001

PubMed ID: 36477164

ISSN: 0003-2654

eISSN: 1364-5528

Full Text: https://pubs.rsc.org/en/content/articlelanding/2023/AN/D2AN01796B