Nguyen Tuan-Anh, Loan Ngo Thi, Pham Mai Thi Ngoc, Thang Pham Duc, Phan Vu Ngoc, Dinh Ngo Xuan, Van Manh Tien, Ong Van Hoang, Lam Vu Dinh, Le Anh-Tuan
Phenikaa University Nano Institute (PHENA), Phenikaa University Hanoi 12116 Vietnam
Faculty of Materials Science and Engineering, Phenikaa University Hanoi 12116 Vietnam.
RSC Adv. 2024 Oct 29;14(46):34471-34485. doi: 10.1039/d4ra06752e. eCollection 2024 Oct 23.
In this study, Au-NiFeO hetero-nanostructures (Au-NFO HNs) have been successfully developed and proposed as an efficient photoactive material for the construction of a photoelectrochemical sensor for the detection of paracetamol (PCM) under visible light irradiation. When Au NPs were in intimate contact with NFO NFs, a built-in electric field and Schottky barrier at the NFO/Au interface were established and downward band bending occurred. By using monochromatic 532 nm laser excitation, the photo-generated electrons on the NFO conduction band were promptly migrated to the Au Fermi level due to the presence of a built-in electric field and downward band bending, and together with the hot electrons induced by localized surface plasmon resonance characteristics of Au NPs could concurrently contribute to the enhanced photoelectrochemical activity. Furthermore, the Schottky barrier prevents the transfer of photo-generated holes from the valence band of NFO to Au, thereby suppressing the recombination of photo-generated electron-hole pairs and prolonging charge carrier lifetimes. A series of electrochemical kinetic parameters were determined and the results showed that in the presence of visible light irradiation, the interfacial charge transfer ability, electrocatalytic activity, and adsorption/diffusion capacity of Au-NFO HNs-modified electrode were remarkably enhanced compared to the dark environment. As a result, the photoelectrochemical sensing platform based on Au-NFO HNs showed noteworthy analytical performance towards PCM detection in the wide linear ranges from 0.5-200 μM, high electrochemical sensitivity of 1.089 μA μM cm, and low detection limit of 0.38 μM. Furthermore, the repeatability, anti-interference ability, and feasibility of the proposed photoelectrochemical sensor were also evaluated. This study will establish a more comprehensive understanding and promote ongoing interest in constructing advanced and efficient plasmonic metal/semiconductor hetero-nanostructures for analytical photoelectrochemistry.
在本研究中，成功制备了金-镍铁氧化物异质纳米结构（Au-NFO HNs），并将其作为一种高效的光活性材料，用于构建在可见光照射下检测扑热息痛（PCM）的光电化学传感器。当金纳米颗粒（Au NPs）与镍铁氧化物纳米纤维（NFO NFs）紧密接触时，在NFO/Au界面处建立了内建电场和肖特基势垒，并且发生了向下的能带弯曲。通过使用532 nm单色激光激发，由于内建电场和向下的能带弯曲的存在，NFO导带上的光生电子迅速迁移到Au费米能级，并且与由Au NPs的局域表面等离子体共振特性诱导的热电子一起，能够同时促进增强的光电化学活性。此外，肖特基势垒阻止光生空穴从NFO的价带转移到Au，从而抑制光生电子-空穴对的复合并延长电荷载流子寿命。测定了一系列电化学动力学参数，结果表明，在可见光照射下，与黑暗环境相比，Au-NFO HNs修饰电极的界面电荷转移能力、电催化活性和吸附/扩散能力显著增强。结果，基于Au-NFO HNs的光电化学传感平台在0.5-200 μM的宽线性范围内对PCM检测表现出值得注意的分析性能，具有1.089 μA μM cm的高电化学灵敏度和0.38 μM的低检测限。此外，还评估了所提出的光电化学传感器的重复性、抗干扰能力和可行性。本研究将建立更全面的理解，并促进对构建用于分析光电化学的先进且高效的等离子体金属/半导体异质纳米结构的持续关注。
