Dual-functional Cu_(2)O/g-C_(3)N_(4) heterojunctions: a high-performance SERS sensor and photocatalytic self-cleaning system for water pollution detection and remediation  

作　　者：Shuo Yang Kaiyue Li Ping Huang Keyan Liu Wenhui Li Yuquan Zhuo Ziwen Yang Donglai Han 

机构地区：[1]School of Materials Science and Engineering,Changchun University,130022 Changchun,China [2]Laboratory of Materials Design and Quantum Simulation College of Science Changchun University,130022 Changchun,China [3]School of Materials Science and Engineering,Changchun University of Science and Technology,130022 Changchun,China

出　　处：《Microsystems & Nanoengineering》2024年第6期325-340,共16页微系统与纳米工程(英文)

基　　金：financial support from the development of Science and Technology of Jilin province(Item No.YDZJ202401541ZYTS).

摘　　要：This study introduces a multifunctional device based on Cu_(2)O/g-C_(3)N_(4) monitoring and purification p–n heterojunctions(MPHs),seamlessly integrating surface-enhanced Raman scattering(SERS)detection with photocatalytic degradation capabilities.The SERS and photocatalytic performances of the Cu_(2)O in various morphologies,g-C_(3)N_(4) nanosheets(NSs)and Cu_(2)O/g-C_(3)N_(4) MPHs with different g-C_(3)N_(4) mass ratios were systematically evaluated,with a particular emphasis on the Cu_(2)O/g-C_(3)N_(4)-0.2 MPH,where g-C_(3)N_(4) constituted 20%of the total mass.Multiple optical and electrochemical tests revealed that the Cu_(2)O/g-C_(3)N_(4)-0.2 MPH effectively enhances charge separation and reduces charge transfer resistance.The Cu_(2)O/g-C_(3)N_(4)-0.2 SERS sensor exhibited a relative standard deviation(RSD)below 15%and achieved an enhancement factor(EF)of 2.43×106 for 4-ATP detection,demonstrating its high sensitivity and consistency.Additionally,it demonstrated a 98.3%degradation efficiency for methyl orange(MO)under visible light within 90 min.Remarkably,even after 216 days,its photocatalytic efficiency remained at 93.7%,and it retained an 84.0%efficiency after four cycles.XRD and SEM analyses before and after cycling,as well as after 216 days,confirmed the structural and morphological stability of the composite,demonstrating its cyclic and long-term stability.The excellent performance of the Cu_(2)O/g-C_(3)N_(4) MPH is attributed to its Z-type mechanism,as verified by radical trapping experiments.The evaluation of the self-cleaning performance of the Cu_(2)O/g-C_(3)N_(4)-0.2 SERS sensor demonstrated that its Z-scheme structure not only provides excellent self-cleaning capability but also enables the detection of both individual and mixed pollutants,while significantly enhancing the SERS signal response through an effective charge transfer enhancement mechanism.

关 键 词：mechanism. stability. performance 

分 类 号：O65[理学—分析化学]