An enhanced photoelectrochemical sensor based on CuBi₂O₄/HOF-101 heterojunction for highly sensitive detection of sulfadiazine.

Authors

Muyun Zhao, Wangui Peng, Weihong Huang, Wanzhen Xu, Wenming Yang

Published in

Mikrochimica acta. Volume 193. Issue 8. Jul 14, 2026. Epub Jul 14, 2026.

Abstract

A type-II heterojunction was constructed by integrating p‑type CuBi₂O₄ with n‑type HOF‑101 to enhance charge separation and transport. The resulting heterostructure generated a photocurrent response of 650 nA, more than twice that of pristine HOF‑101. Based on this improved photoactive interface, a photoelectrochemical aptasensor was developed for the detection of sulfadiazine. The sensor showed a wide linear range from 0.001 to 1000 ng/mL, and achieved a detection limit of 0.7 pg/mL. When applied to spiked water and milk samples, the recoveries ranged from 97.6% to 103.7%. These results indicate that interface engineering via heterojunction construction offers a practical route to enhance the sensing performance of HOF‑based materials, enabling trace‑level detection of pollutants in complex matrices.

PMID:
42446754
Bibliographic data and abstract were imported from PubMed on 14 Jul 2026.

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