Prof. Mark T. Swihart Profile

Prof. Mark T. Swihart

at Univ at Buffalo

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Author

Publications (5)

Proceedings Article | 1 April 2022 Presentation

Aerosol synthesis of nanomaterials for photonics by laser pyrolysis

Mohammad Malekzadeh, Mark Swihart

Proceedings Volume PC11990, PC119900E (2022) https://doi.org/10.1117/12.2615325

KEYWORDS: Photonics, Nanomaterials, Aerosols, Nanoparticles, Quantum dot light emitting diodes, Photonic crystals, Laser applications, Crystals, Carbon dioxide lasers, Biophotonic applications

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Proceedings Article | 12 February 2007 Paper

Nanostructured porous polymeric photonic bandgap structures for sensing

Sung Jin Kim, Vamsy Chodavarapu, Rachel Bukowski, A. Titus, Alexander Cartwright, Mark Swihart, Frank Bright, Timothy Bunning

Proceedings Volume 6447, 64470O (2007) https://doi.org/10.1117/12.716666

KEYWORDS: Sensors, Polymers, Chemical elements, Oxygen, Luminescence, Polymeric sensors, Structural sensing, Reflection, Glucose, Optical sensors

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Proceedings Article | 30 August 2006 Paper

Tunable porous photonic bandgap structures for chemical and biological sensing

Sung Jin Kim, Vamsy Chodavarapu, Firdous Kamal, Vincent Hsiao, Alexander Cartwright, Mark Swihart, Paras Prasad, Timothy Bunning

Proceedings Volume 6322, 632201 (2006) https://doi.org/10.1117/12.681356

KEYWORDS: Polymers, Sensors, Reflection, Liquid crystals, Holography, Chemical elements, Luminescence, Glasses, Silicon, Prisms

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Proceedings Article | 14 November 2003 Paper

Ultrafast dynamics in nanostructured materials

Alexander Cartwright, William Kirkey, Madalina Furis, Xuegeng Li, Yuanqing He, David MacRae, Yudhisthira Sahoo, Mark Swihart, Paras Prasad

Proceedings Volume 5222, (2003) https://doi.org/10.1117/12.509341

KEYWORDS: Nanoparticles, Silicon, Luminescence, Polymers, Etching, Indium, Visible radiation, Electroluminescence, Nanostructuring, Spectroscopy

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Proceedings Article | 14 November 2003 Paper

High-rate synthesis and characterization of brightly luminescent silicon nanoparticles with applications in hybrid materials for photonics and biophotonics

Mark Swihart, Xuegeng Li, Yuanqing He, William Kirkey, Alexander Cartwright, Yudhisthira Sahoo, Paras Prasad

Proceedings Volume 5222, (2003) https://doi.org/10.1117/12.509337

KEYWORDS: Silicon, Particles, Nanoparticles, Atmospheric particles, Luminescence, Etching, Photonics, Polymers, Biomedical optics, Gas lasers

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This presentation focuses on the synthesis and characterization of luminescent silicon nanoparticles that have potential as components of hybrid inorganic/organic materials for photonic and biophotonic applications. In our lab, silicon nanoparticles with bright visible photoluminescence are being prepared by a new combined vapor-phase and solution-phase process, using only inexpensive commodity chemicals. CO₂ laser-induced pyrolysis of silane is used to produce Si nanoparticles at high rates (20 to 200 mg/hour). Particles with an average diameter as small as 5 nm can be prepared directly by this method. Etching these particles with mixtures of hydrofluoric acid (HF) and nitric acid (HNO₃) reduces the size and passivates the surface of these particles such that they exhibit bright visible luminescence at room temperature. The wavelength of maximum photoluminescence (PL) intensity can be controlled from above 800 nm to below 500 nm by controlling the etching time and conditions. Particles with blue and green emission are prepared by rapid thermal oxidation of orange-emitting particles. These particles have exciting potential applications in optoelectronics, display technology, chemical sensing, biological imaging, and other areas. The availability of relatively large quantities of these particles is allowing us to begin to functionalize particles for these applications, as well as to study the optical, electronic, and surface chemical properties of them. All of these potential applications require inorganic/organic hybrid materials, in the sense that the nanoparticles must have their surfaces coated with organic molecules that mediate the interaction of the particles with the polymeric or biological host matrix. The particle synthesis methods, photoluminescence measurements on the particles, the stability of the photoluminescence properties with time, chemical quenching of photoluminescence, and functionalization of the particles for incorporation into different organic matrices or for specific interaction with small molecules or biomolecules are discussed in the context of applications to photonics and biophotonics.

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