TiO2:InN奈米粒子化合物的研究

Abstract

研究InN與TiO2奈米粒子，利用sol-gel與hydrothermal合成不同粒徑大小的TiO2與InN奈米粒子化合物，藉由XRD、SEM、TEM、UV-Vis分析粒子組成方式與光學特性。 組成兩種不同奈米粒子，粒徑較小的InN吸附在TiO2上稱為InN: TiO2反之為粒徑較小的TiO2吸附在InN上稱為TiO2:InN，並探討兩種不同組成方式的化合物光電和光催化反應的特性。 InN: TiO2經UV-Vis圖譜觀察到吸收範圍從390 nm延伸至800 nm，然而於放射汙染物質Methyl Orange (MO)在氙燈下進光催化能力測試，卻沒有任何反應，在photoluminescence (PL) 230 nm激發下沒有任何放光訊號產生。TiO2:InN光吸收與InN: TiO2結果相似，在390 nm與500 nm間的吸收些微降低，在PL 230nm激發測量下，存在一個較寬的訊號於325 nm與410 nm之間與分別佇立在425 nm與480 nm兩根尖銳的訊號，在氙燈下進行光催化能力測試，結果媲美純TiO2。

In this study the nanoparticles (NPs) of InN, TiO2 and their composites of varying sizes have been synthesized by hydrothermal and sol-gel methods and characterized with different analytical techniques including XRD, SEM, TEM and optical absorption spectroscopy. Two different composite NPs with smaller InN adsorbed on larger TiO2 NPs (InN:TiO2) and vice versa (TiO2:InN) have been fabricated and studied for their opto-electronic and photo-catalytic properties. The former was found to have a very broad UV-Vis absorption spectrum extending from 390 nm to much beyond 800 nm; however, no photo-catalytic activity was observed under the irradiation of a Xe-lamp and no photo- luminescence (PL) was detected upon excitation at 230 nm. On the other hand, the latter composite was found to have a similar but a smaller absorption between 390 nm and 500 nm, with an increasing absorptivity at longer wavelengths. In addition, the TiO2:InN composite was found to exhibit a broad PL peak between 325 and 410 nm together with two sharper ones at 425 nm and 480 nm upon excitation at 230 nm. The photo-catalytic activity of the TiO2:InN composite NPs was found to be similar to that of pure TiO2 NPs under Xe-lamp irradiation.