Effects of Substrate Surface Functionality on Solution-Deposited Titania Films

Abstract

Liquid-phase deposition (LPD) from aqueous solution, under mild conditions of temperature (e55 °C) and pH (2.88-3.88), can produce thin (0.1-1.0 µm), adherent titania (TiO 2 ) films. This paper reports a systematic study of LPD TiO 2 films on variously prepared silicon wafer substrates, including (to our knowledge for the first time with LPD) several types of sulfonated surfaces (including sulfonated self-assembled monolayers and sulfonated polyelectrolyte multilayers). The growth rate and crystallinity of these films could be controlled by careful manipulation of solution parameters and surface functionality of the substrate.

Nanofabrication of Metal Oxide Patterns Using Self-Assembled Monolayers

“…40 For the adhesion of TiO 2 films to silanol groups, the pH of the deposition solution is critical. Pizem et al 13 reported that adherent TiO 2 films formed from solutions similar to those used here at pH=3.9, but that the films were less adherent at pH=2.9. They related this difference www.intechopen.com Nanofabrication 8 in adherence to an increased electrostatic attraction of TiO 2 to the oxidized surface of silicon at the higher pH.…”

“…(a) and low electrostatic attraction. 13 However, some depositions were observed on octadecyl group regions in SEM micrographs. One probable cause is that pinholes and other defects in the films provide at least some degree of access of water to underlying unreacted OH groups in the OTS films.…”

“…The fabrication of metal oxide thin films from solutions has been encouraged by the development of environment-friendly chemistry such as Green & sustainable chemistry [1][2][3][4][5][6] , Bioinspired materials chemistry 7 , Biomimetic materials chemistry 7 , Soft-solution processing [8][9][10] , Soft chemistry ("Chimie douce" in French) 11 , Liquid phase deposition 7,12 , Chemical bath deposition (CBD) 12,13 , Electroless deposition (ED) with catalyst 12,13 , Successive ion layer adsorption and reaction (SILAR) 12,13 , Sol-gel process 14,15 , Hydrothermal reaction 16 , Electrodeposition 17,18 and so on. Solution processing of metal oxides allows us to prepare metal oxide thin films on the surface of solids such as substrates, particles, and fibers.…”

Nano/micro-patterning of anatase TiO2thin film from an aqueous solution by site-selective elimination method

“…Pizem et al [3] reported that adherent TiO 2 films formed from solutions similar to those used here at pH 3.9 (i.e. the pH used in the films of Figs.…”

“…Many techniques for the synthesis of ceramic thin films from aqueous solutions at low temperatures (25 -100 8C) have been reported [2,3] The main techniques for non-electrochemical synthesis of polycrystalline ceramic films from aqueous solutions at low temperatures, and some of the materials produced using them, are as follows [1] [4,5] but is being increasingly studied as a route for films of oxides such as TiO 2 [6 -13] and others [2].…”