AuNPs/g-C_(3)N_(4)/BiOCl_(0.5)Br_(0.5)异质结增敏传感器对2-氯乙基磷酸的光电化学传感  

AuNPs/g-C_(3)N_(4)/BiOCl_(0.5)Br_(0.5)Heterojunction Sensitizing Sensor for Photoelectrochemical Sensing of 2-Chloroethyl Phosphoric Acid

作　　者：闫鑫蕊 李君 孔龙飞 李梦雅 李红丽 钱程 王猛 张雪菲 闫璐 韩金言 顾文秀 杨宏郁 康泽坤 肖凤娟 YAN Xin-Rui;LI Jun;KONG Long-Fei;LI Meng-Ya;LI Hong-Li;QIAN Cheng;WANG Meng;ZHANG Xue-Fei;YAN Lu;HAN Jin-Yan;GU Wen-Xiu;YANG Hong-Yu;KANG Ze-Kun;XIAO Feng-Juan(Hebei Provincial Key Laboratory of New Materials for the Coordinated Development of Transportation Engineering and Environment,School of Materials Science and Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学材料科学与工程学院,河北省交通工程与环境协同发展新材料重点实验室,石家庄050043

出　　处：《分析化学》2021年第5期798-808,共11页Chinese Journal of Analytical Chemistry

基　　金：河北省自然科学基金项目(No.B2014210014);河北省重点研发计划项目(No.18273702D);石家庄铁道大学大学生创新创业训练项目资助。

摘　　要：利用石墨相氮化碳/非整比氯-溴化氧铋(g-C_(3)N_(4)/BiOCl_(0.5)Br_(0.5))异质结协同金纳米粒子(AuNPs)的等离子共振效应,构建了AuNPs/g-C_(3)N_(4)/BiOCl_(0.5)Br_(0.5)/ITO增敏光电化学传感器,用于植物激素2-氯乙基磷酸(ETH)的快速、灵敏检测。采用扫描电镜(SEM)、X射线衍射(XRD)、能谱分析(EDS)等方法对AuNPs/g-C_(3)N_(4)/BiOCl_(0.5)Br_(0.5)材料的形貌、结构、膜电极特性进行了分析;采用电化学阻抗(EIS)、电流-时间曲线(i-t)等方法研究了传感器对ETH的光电化学响应。基于密度泛函理论(DFT)计算了g-C_(3)N_(4)/BiOCl_(0.5)Br_(0.5)中原子的电荷密度,分析了异质结电子跃迁机制和传感器的增敏作用机理。传感器瞬态电流与ETH的浓度在20.00 nmol/L~63.00μmol/L范围内呈良好的线性关系,传感器具有良好的选择性、稳定性和准确度。本研究为快速、灵敏检测ETH提供了可行方案,也为构建同类植物激素传感平台提供了新的策略和思路。A new strategy by combining graphite phase carbon nitride/non-integral bismuth oxychloride/bismuth oxybromide(g-C_(3)N_(4)/BiOCl_(0.5)Br_(0.5))heterojunction and the plasma resonance effect of gold nanoparticles(AuNPs)was used to construct a novel AuNPs/g-C_(3)N_(4)/BiOCl_(0.5)Br_(0.5)/ITO sensitized photoelectrochemical sensors for rapid and sensitive detection of the plant hormone 2-chloroethyl phosphate(ETH).The morphology of the as-prepared materials and characteristics of electrode film was characterized by scanning electron microscope(SEM),X-ray diffraction(XRD),energy dispersive spectroscopy(EDS),and the photoelectrochemical response of the sensor to ETH was studied via electrochemical impedance spectroscopy(EIS)and current-time curve(i-t)methods.Density functional theory(DFT)was used to calculate the charge density of atoms in the g-C_(3)N_(4)/BiOCl_(0.5)Br_(0.5)heterojunction,the electronic transition mechanism was analyzed,and the sensor′s sensitization mechanism was further proposed.Under the optimal conditions,ETH concentration had a good linear relationship with photocurrent in the range of 20.00 nmol/L-63.00μmol/L.The AuNPs/g-C_(3)N_(4)/BiOCl_(0.5)Br_(0.5)/ITO sensor exhibited high stability and high reproducibility.This study provided a feasible strategy for rapid and efficient detection of ETH,as well as a new sensing platform for detection of other plant hormones.

关 键 词：石墨相氮化碳 非整比氯-溴化氧铋 增敏光电化学传感器 密度泛函 选择性 2-氯乙基磷酸 

分 类 号：TP212.2[自动化与计算机技术—检测技术与自动化装置] O657.1[自动化与计算机技术—控制科学与工程] TS255.7[理学—分析化学]