Ni and O co-modified MoS2 as universal SERS substrate for the detection of different kinds of substances

Rui Su; Shuo Yang; Donglai Han; Mingyue Hu; Yang Liu; Jinghai Yang; Ming Gao

doi:10.1016/j.jcis.2022.12.075

Ni and O co-modified MoS₂ as universal SERS substrate for the detection of different kinds of substances

J Colloid Interface Sci. 2023 Apr:635:1-11. doi: 10.1016/j.jcis.2022.12.075. Epub 2022 Dec 17.

Authors

Rui Su¹, Shuo Yang², Donglai Han³, Mingyue Hu⁴, Yang Liu⁵, Jinghai Yang⁴, Ming Gao⁶

Affiliations

¹ Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun 130103, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China; Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, PR China.
² College of Science, Changchun University, Changchun 130022, PR China.
³ School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, PR China.
⁴ Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun 130103, PR China.
⁵ Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun 130103, PR China; Key Laboratory of Novel Materials for Sensor of Zhejiang Province, Hangzhou Dianzi University, Hangzhou 310012, PR China.
⁶ Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun 130103, PR China. Electronic address: gaomingphy@126.com.

PMID: 36577350
DOI: 10.1016/j.jcis.2022.12.075

Abstract

Surface-enhanced Raman scattering (SERS) has attracted extensive attention as an ultrasensitive detection method. However, the poor biocompatibility and expensive synthesis cost of noble metal SERS substrates have become non-negligible factors that limit the development of SERS technology. Metal chalcogenide semiconductors as an alternative to noble metal SERS substrates can avoid these disadvantages, but the enhancement effect is lower than that of noble metal substrates. Here, we report a method to co-modify MoS₂ by Ni and O, which improves the carrier concentration and mobility of MoS₂. The SERS effect of the modified MoS₂ is comparable to that of noble metals. We found that the improved SERS performance of MoS₂ can be attributed to the following two factors: strong interfacial dipole-dipole interaction and efficient charge transfer effect. During the doping process, the incorporation of Ni and O enhances the polarity and carrier concentration of MoS₂, enhances the interfacial interaction of MoS₂, and provides a basis for charge transfer. During the annealing process, the introduction of O atoms into the S defects reduces the internal defects of doped MoS₂, improves the carrier mobility, and promotes the efficient charge transfer effect of MoS₂. The final modified MoS₂ as a SERS substrate realizes low-concentration detection of bilirubin, cytochrome C, and trichlorfon. This provides promising guidance for the practical inspection of metal chalcogenide semiconductor substrates.

Keywords: Carrier mobility; Co-modification; Enhancement mechanism; MoS(2); SERS.