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Proceedings Article

Confocal Raman microscopy and hyperspectral dark field microscopy imaging of chemical and biological systems

[+] Author Affiliations
Henrique E. Toma, Jorge da Silva Shinohara, Daniel Grasseschi

Univ. de Sao Paulo (Brazil)

Proc. SPIE 9337, Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XII, 933702 (March 11, 2015); doi:10.1117/12.2087618
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From Conference Volume 9337

  • Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XII
  • Alexander N. Cartwright; Dan V. Nicolau
  • San Francisco, California, United States | February 07, 2015

abstract

Hyperspectral imaging can provide accurate information on the distribution of the chemical species in materials and biological samples, based on the analysis of their electronic and vibrational profiles. In special, confocal Raman microscopy is one of the best ways to access the chemical distribution of molecules, especially under resonance Raman or SERS conditions. On the other hand, enhanced dark field optical microscopy can be employed for hyperspectral imaging in the visible and near-IR region, while extending the optical resolution up to the nanoscale dimension. It allows the detection of gold or silver single nanoparticles, as well as spectral monitoring from the characteristic surface plasmon bands. These two hyperspectral microscopies can be conveniently combined to provide nanoscale electronic and vibrational information of the species present in a wide variety of chemical and biological systems. A case study focusing on the improvement of the classical spot-test analysis of nickel(II) ions with dithizone is here detailed. A great enhancement of sensitivity in the detection of nickel(II) ions, by at least 4 orders of magnitude, has been observed in this work. Hyperspectral measurements allowed the mapping of the gold nanoparticles (AuNP) distribution on cellulose fibers and on glass, and the evaluation of their extinction and SERS spectra for analytical purposes. © (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

Henrique E. Toma ; Jorge da Silva Shinohara and Daniel Grasseschi
" Confocal Raman microscopy and hyperspectral dark field microscopy imaging of chemical and biological systems ", Proc. SPIE 9337, Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XII, 933702 (March 11, 2015); doi:10.1117/12.2087618; http://dx.doi.org/10.1117/12.2087618


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