Determination of Photoluminescence Quantum Yields of Scattering Media with an Integrating Sphere: Direct and Indirect Illumination

2015 ◽  
Vol 69 (6) ◽  
pp. 749-759 ◽  
Author(s):  
Christian Würth ◽  
Ute Resch-Genger
Keyword(s):  
Quantum Yields ◽  
Integrating Sphere ◽  
Scattering Media ◽  
Indirect Illumination

Evaluation of a Commercial Integrating Sphere Setup for the Determination of Absolute Photoluminescence Quantum Yields of Dilute Dye Solutions

2010 ◽  
Vol 64 (7) ◽  
pp. 733-741 ◽  
Author(s):  
Christian Würth ◽  
Cornelia Lochmann ◽  
Monika Spieles ◽  
Jutta Pauli ◽  
Katrin Hoffmann ◽  
...  
Keyword(s):  
Quantum Yields ◽  
Integrating Sphere ◽  
Dye Solutions

Determination of ppb-Level CO, CO2, CH4, and H2O in High-Purity Gases Using Matrix Isolation FT-IR with an Integrating Sphere

1994 ◽  
Vol 66 (23) ◽  
pp. 4354-4358 ◽  
Author(s):  
Yoshimasa. Ogawara ◽  
Albert. Bruneau ◽  
Takako. Kimura
Keyword(s):  
High Purity ◽  
Matrix Isolation ◽  
Integrating Sphere ◽  
Ft Ir

scholarly journals Photocatalytic Activity: Experimental Features to Report in Heterogeneous Photocatalysis

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1990 ◽  
Author(s):  
Md. Hoque ◽  
Marcelo Guzman
Keyword(s):  
Reaction Rate ◽  
Monochromatic Light ◽  
Heterogeneous Photocatalysis ◽  
Research Articles ◽  
Quantum Yields ◽  
Characterization Methods ◽  
Valuable Data ◽  
Photocatalytic Activities ◽  
Scientific Papers

Heterogeneous photocatalysis is a prominent area of research with major applications in solar energy conversion, air pollution mitigation, and removal of contaminants from water. A large number of scientific papers related to the photocatalysis field and its environmental applications are published in different journals specializing in materials and nanomaterials. However, many problems exist in the conception of papers by authors unfamiliar with standard characterization methods of photocatalysts as well as with the procedures needed to determine photocatalytic activities based on the determination of “apparent quantum efficiencies” within a wavelength interval or “apparent quantum yields” in the case of using monochromatic light. In this regard, an astonishing number of recent research articles include claims of highly efficient (photo)catalysts or similar terms about materials with superior or enhanced efficiency for a given reaction without proper experimental support. Consequently, the comparison of the efficiencies of photocatalysts may result as being meaningless, especially when reports are only based on expressions determining (1) a reaction rate per weight of catalyst or its surface area, (2) quantum efficiencies or quantum yields, and (3) turnover frequencies or turnover numbers. Herein, we summarize the standards needed for reporting valuable data in photocatalysis and highlight some common discrepancies found in the literature. This work should inform researchers interested in reporting photocatalysis projects about the correct procedures for collecting experimental data and properly characterizing the materials by providing examples and key supporting literature.

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