Preparation and growth mechanism of solidified TiO2 film on polyimide by SILAR at room temperature

Abstract

In order to further expand the applications of polyimide, titanium oxide (TiO2) was deposited on flexible Kapton substrate by successive ionic layer adsorption and reaction (SILAR) method at room temperature. The growth process was systematically investigated by analyzing the changes of surface structures, film thickness, water wettability and adhesion work during film deposition. The results showed the SILAR TiO2 films growth initializes in an island-like pattern and then gradually transforms into a 2D layered manner after 10 deposition cycles with a growth rate of about 0.5 nm/cycle. With the increase of cycle number, the water wettability and adhesion work increased to ensure the deposition process to be continued. Interestingly, the obtained TiO2 film exhibits weak crystallinity, which is attributed to the surface graphitized structure of Kapton induced by the ultraviolet (UV) activation in ambient. However, no information of the crystalline phase was detected when TiO2 films were deposited on glass or polyethylene (PE) substrates without the special graphit-like structures under the same conditions. Hence, the growth mechanisms as the surface reactions, film formation and continuous growth behaviors of TiO2 film on Kapton substrate were discussed in details.

TiO2 Nanotube Arrays on Flexible Kapton Substrates for Photo-Electrochemical Solar Energy Conversion

“…Full-range scans in the wavenumber range of 100−3000 cm −1 reveal peaks corresponding to the Kapton substrate at approximately 1390, 1600, and 1790 cm −1 . Such an observation is consistent with the report by Sun et al 38 In order to investigate the presence of crystalline TiO 2 , high-resolution scan was carried out in the range of 100−1000 cm −1 . The plot (inset) shows Raman peaks corresponding to the TiO 2 rutile phase at 270 and 607 cm −1 , while that of the anatase phase at 152 and 424 cm −1 .…”

“…These observations are consistent with the Raman spectra reported for TiO 2 nanotubes grown on Kapton and Si wafer substrates. 38,39 Furthermore, the Raman spectra also support the XRD data reported for the samples, in which both rutile and anatase phases were observed. The FTIR spectra of the TiO 2 nanotubes before and after the solvothermal process are shown in Figure 9.…”

Effect of SILAR Cycles on the Thickness, Structural, Optical Properties of Cobalt Selenide Thin Films

“…From 15 SILAR cycles, the growth rate decreased gradually from 10.85 nm/cycle to 10.23 nm/cycles. The trend is similar to result obtained by [26].…”

“…As expected, in one SILAR cycle a single layer of CoSe2 film was deposited. As SILAR cycles increase, more layers of CoSe2 were deposited which leads to increase in film's final thickness This result is similar to increase in the thickness as SILAR cycles increase obtained by [26,27,28,29]. According to [27], the increase maybe as a result of increase in reaction time available for the growth of thin film.…”

Ag-enriched TiO2 nanocoating apposite for self-sanitizing/ self-sterilizing/ self-disinfecting of glass surfaces

“…The FTIR spectra of anatase Ag–TiO 2 NCs absorbance bands appeared at different peak locations for different enriching contents. The dual bands observed at 618–638 and 655-692 cm −1 epitomize the characteristic Ti–O bonds of anatase TiO 2 NCs [ 42 ]. The presence of band around 718-748 cm −1 was attributed to vibrations of the Ti–O–Ti stretching bond [ 43 ].…”