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Silica crystalline colloidal array deep ultraviolet narrow-band diffraction devices

Wang, L and Tikhonov, A and Asher, SA (2012) Silica crystalline colloidal array deep ultraviolet narrow-band diffraction devices. Applied Spectroscopy, 66 (4). 426 - 431. ISSN 0003-7028

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We developed a facile method to fabricate deep ultraviolet (UV) photonic crystal crystalline colloidal array (CCA) Bragg diffraction devices. The CCAs were prepared through the self-assembly of small, monodisperse, highly surface charged silica particles (∼50 nm diameter) that were synthesized by using a modified Stöber process. The particle surfaces were charged by functionalizing them with the strong acid, non-UV absorbing silane coupling agent 3-(trihydroxylsilyl)-1-propane-sulfonic acid (THOPS). These highly charged, monodisperse silica particles self assemble into a face-centered cubic CCA that efficiently Bragg diffracts light in the deep UV. The diffracted wavelength was varied between 237 nm to 227 nm by tilting the CCA orientation relative to the incident beam between glancing angles from 90° to ∼66°. Theoretical calculations predict that the silica CCA diffraction will have a full width at half-maximum (FWHM) of 2 nm with a transmission of ∼10 -11 at the band center. We demonstrate the utility of this silica CCA filter to reject the Rayleigh scattering in 229 nm deep UV Raman measurements of highly scattering Teflon. © 2012 Society for Applied Spectroscopy.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Wang, L
Tikhonov, A
Asher, SAasher@pitt.eduASHER
Date: 1 April 2012
Date Type: Publication
Journal or Publication Title: Applied Spectroscopy
Volume: 66
Number: 4
Page Range: 426 - 431
DOI or Unique Handle: 10.1366/11-06527
Schools and Programs: Dietrich School of Arts and Sciences > Chemistry
Refereed: Yes
ISSN: 0003-7028
MeSH Headings: Colloids--chemistry; Equipment Design; Particle Size; Polytetrafluoroethylene--chemistry; Silicon Dioxide--chemistry; Spectrophotometry, Ultraviolet--instrumentation; Spectrum Analysis, Raman--instrumentation
PubMed ID: 22449324
Date Deposited: 15 Feb 2013 14:26
Last Modified: 22 Jun 2021 14:55


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