Photoactive Au@MoS2 Micromotors for Dynamic Surface-Enhanced Raman Spectroscopy Sensing
Authors
Asunción Nadal, Víctor de la; Perales Rondon, Juan V.; Colina, Álvaro; Jurado Sánchez, Beatriz; Escarpa Miguel, Jesús AlbertoIdentifiers
Permanent link (URI): http://hdl.handle.net/10017/59191DOI: https://doi.org/10.1021/acsami.3c12895
ISSN: 1944-8244
Date
2023-11-16Affiliation
Universidad de Alcalá. Departamento de Química Analítica, Química Física e Ingeniería QuímicaFunders
Ministerio de Ciencia e Innovación
European Commission
Bibliographic citation
ACS Applied Materials & Interfaces, 2023, v. 15, n. 47, p. 54829-54837
Keywords
photophoretics
warming
dichalcogenides
mobile SERS substrates
crystal violet
malachitegreen
paraquat
Project
info:eu-repo/grantAgreement/MICINN//PID2020-118154GB-I00/ES/
info:eu-repo/grantAgreement/MICINN//TED2021-132720B-I00/ES/
info:eu-repo/grantAgreement/EC//PID2020-113154RB-C21/EU/
Document type
info:eu-repo/semantics/article
Version
info:eu-repo/semantics/publishedVersion
Rights
© The Authors
Attribution 4.0 International (CC BY 4.0)
Access rights
info:eu-repo/semantics/openAccess
Abstract
Photophoretic Au@MoS2 micromotors are used as smart mobile substrates for dynamic surface-enhanced Raman spectroscopy (SERS) sensing. The photophoretic capabilities and swarming-like propulsion of the micromotors allow for their schooling and accumulation in the measuring spot, increasing the density of SERS-active gold nanoparticles for Raman mapping and, simultaneously, the preconcentration of the target analyte. The generation of "hot-microflake spots" directly in the Raman irradiation point results in a 15-18-fold enhancement in the detection of crystal violet without the requirement for additional external sources for propulsion. Moreover, the reproducible collective micromotor motion does not depend on the exact position of the laser spot concerning individual micromotors, which greatly simplifies the experimental setup, avoiding the requirements of sophisticated equipment. The strategy was further applied for the detection of malachite green and paraquat with a good signal enhancement. The new on-the-move-based SERS strategy holds great promise for on-site detection with portable instrumentation in a myriad of environmental monitoring and clinical applications.
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