An oxygen vacancy-engineered Bi2MoO6 light collector with prominent SERS enhancement for ultrasensitive detection and degradation of organic contaminants

• Published in: Journal of alloys and compounds Vol. 945; p. 169233
• Main Authors: Tan, Lu, Yuan, Baozhen, Lou, Yongbing, Su, Yu, Zhu, Jun-Jie
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 05.06.2023
• Subjects: Bi2MoO6; CM-based SERS; Light harvesting; Organic contaminants; Oxygen vacancy; Photocatalysis; CM-based SERS; Bi2MoO6; Organic contaminants; Light harvesting; Photocatalysis; Oxygen vacancy
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2023.169233

Surface-enhanced Raman scattering (SERS) based on the chemical mechanism (CM) has attracted tremendous attention for high stability and reproducibility. However, effectively improving the sensitivity of CM-based SERS remains a challenge. Herein, an oxygen vacancy-engineered bismuth molybdate (Bi2MoO6) light collector with superior SERS sensitivity and high reproducibility was developed as CM enhancing substrate. The Raman enhancement factor (EF) was calculated to be 2.7 × 107, resulting in an ultra-low limit of detection (LOD) for methyl orange (MO) down to 1.92 × 10−11 M. The remarkable SERS enhancement was ascribed to the synergistic effect of oxygen vacancy-promoted photoinduced charge transfer (PICT), enhanced light-harvesting ability, and molecule enrichment through cavity-like micro/nanostructures. Moreover, the PICT line contributed to effective charge separation, which resulted in enhanced photocatalytic activity of the Bi2MoO6 substrate for self-cleaning utilization. The dual-functional substrate presented excellent SERS activity and recyclability in the SERS detection of organic contaminants in wastewater samples. The oxygen vacancy-engineered Bi2MoO6 light collector provides new insight for rational CM-based SERS substrate design and opportunities for developing recyclable SERS substrates and extending applications of semiconductor-based SERS. [Display omitted] •Oxygen vacancy-engineered Bi2MoO6 was fabricated as CM-based SERS substrate.•The introduction of oxygen vacancy enhanced photoinduced charge transfer (PICT).•Synergism of PICT, light-trapping effect and molecules enrichment improved SERS.•The sensitive detection and effective remove of organic contaminants was realized.•The limit of detection for methyl orange (MO) was down to 1.92 × 10−11 M.