Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 320, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2020.128445
Keywords
Plasmon-free SERS; MoS2; Graphene; Molecular pre-concentration
Funding
- National Natural Science Foundation of China (NSFC) [61774124, 51572216, 61604122]
- Fundamental Research Funds for the Central Universities [1191329876, 1191329152]
- 111 Program [B14040]
- High Performance Computing (HPC) Platform, Xi'an Jiaotong University
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High surface-enhanced Raman spectroscopy (SERS) activity is ordinarily derived from noble-metal nanoarrays. In recent years, certain two-dimensional (2D) inorganic materials have become suitable for SERS. However, the limits of detection (LODs) of these plasmon-free materials are insufficient for meeting the requirements of molecular analysis. Herein, the centralization of the probe molecule pre-concentration process, and enhancement of interfacial interactions between the substrate and molecules were pivotal accomplishments in the development of a hetero-substrate comprised of a wrinkled semiconducting 2H-phase MoS2 (W-MoS2) platform decorated with graphene-microflowers (GMFs), for the achievement of noble-metal-comparable SERS detection. The GMFs served as supersized molecular enrichers, creating abundant SERS 'active regions', and thus, the LOD in the adsorption equilibrium state was 5 x 10(-11) M for rhodamine B (RhB), and the maximum enhancement factor (EF) was 2.96 x 10(7). Additionally, performance degradation of GMFs/W-MoS2 was below 6 %, following long-term detection over 50 days. The sub-nanomolar sensitivity of the GMFs/W-MoS2 substrate can be attributed to the synergistic effects of the efficacious pre-concentration of probe molecules, enhanced charge-transfer, and multiple light scattering, all of which can promote the progress of plasmon-free SERS detection.
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