We present a hands-on activity designed for advanced physical chemistry courses for Master’s students on the application of photocatalysis to the modification of the surface properties of a semiconductor (titanium dioxide). The wetting properties of TiO2 films, deposited from commercial powders, are studied before and after UV irradiation. Irradiation-induced superhydrophilicity is exploited to provide antifogging properties. The TiO2 films are then functionalized with a perfluorinated alkylsilane to impart superhydrophobicity and subsequently lithographed by irradiation through a photomask: the photocatalytic degradation of the organic chains in the irradiated areas leads to a wetting contrast that can be revealed using dye solutions. This experience can be easily adapted to be suited for undergraduates or high-school students as well as to demonstrations for science festivals.

Wetting Modification by Photocatalysis: A Hands-on Activity To Demonstrate Photoactivated Reactions at Semiconductor Surfaces / L. Rimoldi, T.T.A. Taroni, D. Meroni. - In: JOURNAL OF CHEMICAL EDUCATION. - ISSN 0021-9584. - 95:12(2018 Dec 11), pp. 2216-2221. [10.1021/acs.jchemed.8b00362]

Wetting Modification by Photocatalysis: A Hands-on Activity To Demonstrate Photoactivated Reactions at Semiconductor Surfaces

L. Rimoldi
Primo
;
T.T.A. Taroni
Secondo
;
D. Meroni
Ultimo
2018-12-11

Abstract

We present a hands-on activity designed for advanced physical chemistry courses for Master’s students on the application of photocatalysis to the modification of the surface properties of a semiconductor (titanium dioxide). The wetting properties of TiO2 films, deposited from commercial powders, are studied before and after UV irradiation. Irradiation-induced superhydrophilicity is exploited to provide antifogging properties. The TiO2 films are then functionalized with a perfluorinated alkylsilane to impart superhydrophobicity and subsequently lithographed by irradiation through a photomask: the photocatalytic degradation of the organic chains in the irradiated areas leads to a wetting contrast that can be revealed using dye solutions. This experience can be easily adapted to be suited for undergraduates or high-school students as well as to demonstrations for science festivals.
Physical Chemistry; Surface Science; Materials Science; Photochemistry; Hands-On Learning/Manipulatives; High School/Introductory Chemistry; First-Year Undergraduate/General; Upper-Division Undergraduate
Settore CHIM/02 - Chimica Fisica
set-2018
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/605993
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