Schottky Barrier and Surface Plasmonic Resonance Phenomena Towards the Photocatalytic Reaction: Study of Their Mechanisms to Enhance Photocatalytic Activity

Khan, Maksudur R. and Chuan, Tan Wooi and Yousuf, Abu and Chowdhury, M. N. K. and Cheng, C. K. (2015) Schottky Barrier and Surface Plasmonic Resonance Phenomena Towards the Photocatalytic Reaction: Study of Their Mechanisms to Enhance Photocatalytic Activity. Catalysis Science & Technology, 5 (5). pp. 2522-2531. ISSN 2044-4753. (Published)

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DOI/Official URL: http://dx.doi.org/10.1039/C4CY01545B

Abstract

Metals are doped on semiconductors to enhance the activity of photocatalysts and two possible phenomena can happen at the interfaces of the semiconductors: Schottky barrier formation and Surface Plasmonic Resonance (SPR). Schottky barriers can improve the photoactivity of a reaction by trapping and prolonging the life of the electron. While SPR has the ability to create an electromagnetic field which can improve the photoreaction in three ways: photon scattering, Plasmon Resonance Energy Transfer (PRET) and hot electron excitation. Although both phenomena have been well grounded throughout the field, one crucial ambiguity is still found based on the proposed mechanisms, specifically, what is the direction of electron flow – from metal to semiconductor or vice versa? This feature article reviews the mechanism focusing on how Schottky barrier and SPR phenomena help to improve a photoreaction, as well as the paradox between the Schottky barrier and SPR in the matter of the direction of electron flow in the metal/semiconductor system.

Item Type:	Article
Uncontrolled Keywords:	Schottky barrier; Surface Plasmonic Resonance (SPR); Photocatalysts
Subjects:	Q Science > QD Chemistry
Faculty/Division:	Faculty of Chemical & Natural Resources Engineering
Depositing User:	Dr. MD Maksudur Rahman Khan
Date Deposited:	04 Apr 2016 02:29
Last Modified:	16 Nov 2017 06:26
URI:	http://umpir.ump.edu.my/id/eprint/12608
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