Chemical Surface-Enhanced Coherent Raman Scattering by Semiconductor Nanoparticles

ORAL

Abstract

Raman spectroscopy is a powerful tool for molecular chemical analysis and bio-imaging, which shows an astonishing sensitivity when combined with huge enhancement by the coherence and surface effects. Typically, the surface enhancement is provided by two mechanisms: electromagnetic (EM), i.e. an enhancement of local electric fields, and chemical (CM) enhancement due to the interaction between an analyte and colloidal nanoparticles (NPs). Noble metal NPs have been commonly used for the surface-enhanced coherent anti-Stokes Raman scattering (SECARS) spectroscopy, as they provide large enhancement factors predominantly via the EM mechanism. In turns, the cheaper semiconductor NPs can be a great substitute for noble metals in SECARS applications. In this work, we demonstrate the time resolved SECARS on the pyridine-ethanol solution, containing molybdenum disulfide (MoS2) nanocrystals and investigate the enhancement provided by these semiconductor NPs. We show that the pure CM enhancement factor can be as high as 109. The decreased vibrational dephasing times indicate the charge transfer in pyridine-ethanol-MoS2 system.

*Welch Foundation (A-1547, A-1261, A-0396), NSF (CHE-609608), ONR (N00014-16-1-3054, N00014-16-1-2578) and Air Force Office of Scientific Research (FA9550-18-1-0141)

–

Presenters

  • Anton D. Shutov

    • Institute for Quantum Science and Engineering, Texas A&M University, College Station, TX 77843, USA

Authors

  • Anton D. Shutov

    • Institute for Quantum Science and Engineering, Texas A&M University, College Station, TX 77843, USA

  • Zhenhuan Yi

    • Institute for Quantum Science and Engineering, Texas A&M University, College Station, TX 77843, USA

  • Jizhou Wang

    • Institute for Quantum Science and Engineering, Texas A&M University, College Station, TX 77843, USA

  • Alexander M. Sinyukov

    • Institute for Quantum Science and Engineering, Texas A&M University, College Station, TX 77843, USA

  • Zhe He

    • Institute for Quantum Science and Engineering, Texas A&M University, College Station, TX 77843, USA

  • Chenwei Tang

    • Institute for Quantum Science and Engineering, Texas A&M University, College Station, TX 77843, USA, School of Science, Xi’an Jiaotong University, Xi’an, Shaanxi, 710049, Chi

  • Jiahao Chen

    • Institute for Quantum Science and Engineering, Texas A&M University, College Station, TX 77843, USA, School of Science, Xi’an Jiaotong University, Xi’an, Shaanxi, 710049, Chi

  • Esther J. Ocola

    • Department of Chemistry, Texas A&M University, College Station, TX 77843-3255, USA

  • Jaan Laane

    • Department of Chemistry, Texas A&M University, College Station, TX 77843-3255, USA

  • Alexei V. Sokolov

    • Institute for Quantum Science and Engineering, Texas A&M University, 4242 TAMU, College Station, TX 77843 USA
    • Institute for Quantum Science and Engineering, Texas A&M University, College Station, TX 77843, USA, Baylor Research Innovative Center, Baylor University, Waco, TX 76798, USA

  • Dmitri V. Voronine

    • Department of Physics, University of South Florida, Tampa, FL 33620, USA

  • Marlan O. Scully

    • Texas A&M Univ, Baylor Univ
    • Institute for Quantum Science and Engineering, Texas A&M University, College Station, TX 77843, USA, Baylor Research Innovative Center, Baylor University, Waco, TX 76798, USA