Sonochemical synthesis, photocatalytic activity and optical properties of silica coated ZnO nanoparticles.
In this paper, we report the synthesis of silica coated ZnO nanoparticles by ultrasound irradiation of a mixture of dispersion of ZnO, tetraethoxysilane (TEOS), and ammonia in an ethanol-water solution medium. The silica coating layer formed at the initial TEOS/ZnO loading of 0.8 for 60 min ultrasonic irradiation was uniform and extended up to 3 nm from the ZnO surface as revealed from HR-TEM images. Silica coated ZnO nanoparticles demonstrated a significant inhibition of photocatalytic activity against photodegradation of methylene blue dye in aqueous solution. The effects of silica coating on the UV blocking property of ZnO nanoparticles were also studied.
Department of Advanced Interdisciplinary Sciences, Graduate School of Engineering, Utsunomiya University, Yoto 7-1-2, Utsunomiya 321-8585, Japan. iqbal_siddiquey@yahoo.com
Iqbal Ahmed
IA
Siddiquey
Takeshi
T
Furusawa
Masahide
M
Sato
Newaz Mohammed
NM
Bahadur
Md Mahbubul
MM
Alam
Noboru
N
Suzuki
D002384:Catalysis; D053758:Nanoparticles / Q000737:chemistry*; D055620:Optical Phenomena; D010316:Particle Size; D055668:Photochemical Processes; D012822:Silicon Dioxide / Q000737:chemistry*; D013010:Sonication; D013499:Surface Properties; D015034:Zinc Oxide / Q000737:chemistry*
D012822:Silicon Dioxide; D015034:Zinc Oxide