biostudies-literatureYang SDepartment of Science and Technology of Jilin Province (Jilin Province Science and Technology Department)198https://www.ebi.ac.uk/biostudies/studies/S-EPMC11659583biostudies-literatureUnknown10(1)This study introduces a multifunctional device based on Cu<sub>2</sub>O/g-C<sub>3</sub>N<sub>4</sub> 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<sub>2</sub>O in various morphologies, g-C<sub>3</sub>N<sub>4</sub> nanosheets (NSs) and Cu<sub>2</sub>O/g-C<sub>3</sub>N<sub>4</sub> MPHs with different g-C<sub>3</sub>N<sub>4</sub> mass ratios were systematically evaluated, with a particular emphasis on the Cu<sub>2</sub>O/g-C<sub>3</sub>N<sub>4</sub>-0.2 MPH, where g-C<sub>3</sub>N<sub>4</sub> constituted 20% of the total mass. Multiple optical and electrochemical tests revealed that the Cu<sub>2</sub>O/g-C<sub>3</sMicrosystems & nanoengineeringDual-functional Cu<sub>2</sub>O/g-C<sub>3</sub>N<sub>4</sub> heterojunctions: a high-performance SERS sensor and photocatalytic self-cleaning system for water pollution detection and remediation.PMC11659583YDZJ202401541ZYTSLi WYang ZLiu KZhuo YLi KYang SHan DHuang PfalseDual-functional Cu<sub>2</sub>O/g-C<sub>3</sub>N<sub>4</sub> heterojunctions: a high-performance SERS sensor and photocatalytic self-cleaning system for water pollution detection and remediation.This study introduces a multifunctional device based on Cu<sub>2</sub>O/g-C<sub>3</sub>N<sub>4</sub> 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<sub>2</sub>O in various morphologies, g-C<sub>3</sub>N<sub>4</sub> nanosheets (NSs) and Cu<sub>2</sub>O/g-C<sub>3</sub>N<sub>4</sub> MPHs with different g-C<sub>3</sub>N<sub>4</sub> mass ratios were systematically evaluated, with a particular emphasis on the Cu<sub>2</sub>O/g-C<sub>3</sub>N<sub>4</sub>-0.2 MPH, where g-C<sub>3</sub>N<sub>4</sub> constituted 20% of the total mass. Multiple optical and electrochemical tests revealed that the Cu<sub>2</sub>O/g-C<sub>3</s2024-01-01T00:00:00Z2024 Dec2025-04-27T00:31:40.615Z2025-04-06T17:50:56.021ZS-EPMC116595833970251310.1038/s41378-024-00846-7