Preparationandelectrochromicproperties ofindiumtinoxidenanocrystalfilms

Indium tin oxide (ITO) nanocrystals with different shapes and sizes were synthesized by one and ito nanocrystal films were prepared by spin coating process. The near-infrared spectrum regulation properties of the films prepared by ITO nanocrystals with different morphologies and sizes were studied. .The results show that the visible light transmittance of IT O nanocrystal film is 89.2%,and the resistivityis 54 Omega(.)cm after 5 spincoatings.The films prepared by uniform spherical ITO nanocrystals with an average diameter of (6.88 +/- 1.53)nm exhibit the best near -infrared spectrum regulationability. After applying a voltage of +/- 2.5 V,thespectrumregulationat2000nm is39.3%,andtheopticaldensitychangeis0.43.TheITO nanocrystal film maintains high visible lighttransmittancebeforeandafterelectrochromism.TheelectrochromismofITOnanocrystalsiscaused by change of frequency and intensity of localized surfaceplasmon resonance(LSPR) caused by electron injection/ extraction, and its electrochromic process is realized by capacitor charging and discharging.