Designing of CuS growing on Bi 2 WO 6 nanosheet heterostructures based on a photoelectrochemical aptasensor for detectin
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ORIGINAL PAPER
Designing of CuS growing on Bi2WO6 nanosheet heterostructures based on a photoelectrochemical aptasensor for detecting ofloxacin Wangqiang Huang 1 & Yajie Cheng 2 & Xing Fei 3 & Wangwen Xu 4 & Shuang Chang 5 & Shaodong Song 1 & Changbo Huang 6 Received: 6 May 2020 / Accepted: 18 August 2020 / Published online: 28 September 2020 # Springer-Verlag GmbH Austria, part of Springer Nature 2020
Abstract Bi2WO6 (BW) was compounded with different contents of copper sulfide (CuS) by a two-step procedure. The chemical composition and morphology of the materials were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy. The results of photoelectrochemical (PEC) tests showed that CuS can improve the PEC performance of semiconductor materials and it has the best performance when the CuS mass fraction is 5%. Therefore, CuS/BW-5% nanocomposite has been constructed as ofloxacin (OFL) drug PEC aptasensors by binding of aptamer receptors. The PEC aptasensor based on CuS/BW-5% has a linear relationship for OFL of 1–12,000 nM and a determination limit of 0.35 nM. Since the photoelectron potential generated by CuS/BW-5% heterojunction reduces the combination of photogenerated electrons and holes CuS/BW-5% has a better photoelectrocatalytic performance. Keywords CuS/Bi2WO6 . Photoelectrochemical . Semiconductor . Ofloxacin . Aptasensor
Introduction Ofloxacin (OFL) is a kind of pharmaceutical compound highly consumed by the human being for treating skin tissue and bacterial infections [1–3]. OFL has been widely applied in waste water system as it is toxic for aquatic systems and
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00604-020-04516-z) contains supplementary material, which is available to authorized users. * Yajie Cheng [email protected] 1
Nanzhang County People’s Hospital, Xiangyang 441000, People’s Republic of China
2
Department of Stomatology, Taihe Hospital, Hubei University of Medicine, Shiyan 442000, People’s Republic of China
3
Xiangyang No.1 People’s Hospital, Hubei University of Medicine, Xiangyang 441000, People’s Republic of China
4
Tongren Hospital of Wuhan University, Wuhan 430062, People’s Republic of China
5
Department of Oncology, Taihe Hospital, Hubei University of Medicine, Shiyan 442000, People’s Republic of China
6
Xiangyang Stomatological Hospital, Xiangyang 441000, People’s Republic of China
ecosystem [4, 5]. Therefore, there is an urgent need for the OFL detection. In recent years, the main methods for detecting OFL from water include photocatalytic and electrochemical [6, 7]. Additionally, Adhikari’s group [8] also prepared Bi2S3/ Bi2WO6 hierarchical microstructures that were used for photocatalytic degradation and photoelectrochemical (PEC) sensing of ofloxacin. Among these methods, electrochemical method attracts enormous attention due to its fast response, high sensitivity, and real-time detection, but it suffers from low selectivity [9]. The p
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