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Title: A transparent Pyrex μ-reactor for combined in situ optical characterization and photocatalytic reactivity measurements

A new Pyrex-based μ-reactor for photocatalytic and optical characterization experiments is presented. The reactor chamber and gas channels are microfabricated in a thin poly-silicon coated Pyrex chip that is sealed with a Pyrex lid by anodic bonding. The device is transparent to light in the UV-vis-near infrared range of wavelengths (photon energies between ∼0.4 and ∼4.1 eV). The absorbance of a photocatalytic film obtained with a light transmission measurement during a photocatalytic reaction is presented as a proof of concept of a photocatalytic reactivity measurement combined with in situ optical characterization. Diffuse reflectance measurements of highly scattering photocatalytic nanopowders in a sealed Pyrex μ-reactor are also possible using an integrating sphere as shown in this work. These experiments prove that a photocatalyst can be characterized with optical techniques after a photocatalytic reaction without removing the material from the reactor. The catalyst deposited in the cylindrical reactor chamber can be illuminated from both top and bottom sides and an example of application of top and bottom illumination is presented.
Authors:
;  [1] ;  [2] ; ; ;  [1] ;  [3]
  1. CINF, Department of Physics, Building 312, Fysikvej, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby (Denmark)
  2. (Denmark)
  3. Department of Micro- and Nanotechnology, Nanotech, Building 345 East, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby (Denmark)
Publication Date:
OSTI Identifier:
22220393
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 84; Journal Issue: 10; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; BONDING; CATALYSTS; CYLINDRICAL CONFIGURATION; DEPOSITS; EQUIPMENT; EV RANGE; INFRARED SPECTRA; LIGHT TRANSMISSION; NANOSTRUCTURES; PHOTOCATALYSIS; PHOTOLYSIS; PHOTONS; PYREX; REACTIVITY; SILICON; VISIBLE RADIATION