SINTESIS LAPIS TIPIS ZnO NANOROD BERORIENTASI VERTIKAL PADA SUBSTRAT KACA

WURI APRIYANA, Dr.Indriana Kartini, M.Si

2013 | Tesis | S2 Ilmu Kimia

yaitu deposisi seed layer ZnO pada permukaan substrat dan deposisi ZnO nanorod melalui metode hidrotermal. Kajian awal meliputi perlakuan pencucian dan quenching pada deposisi hidrotermal dilakukan untuk mengurangi deposisi berlebih pada lapis tipis ZnO nanorod berorientasi vertikal. Pengaruh posisi substrat terhadap pertumbuhan ZnO nanorod juga dikaji dalam penelitan ini. Pengaruh waktu hidrotermal dikaji pada variasi waktu 20, 40, 60 dan 120 menit. Lapis tipis yang diperoleh dikarakterisasi menggunakan X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) dan spektrofotometer specular reflectance UV-Vis. Hasil penelitian menunjukkan bahwa proses pencucian dan quenching sebagai metode pascasintesis dapat digunakan untuk mengurangi dan mencegah adanya orientasi acak pada lapis tipis ZnO nanorod. Lapis tipis ZnO nanorod dengan posisi substrat menghadap ke atas memiliki ukuran rod yang lebih panjang dibandingkan pada posisi substrat ke bawah. Peningkatan waktu hidrotermal sebanding dengan peningkatan ukuran diameter dan panjang rod serta kerapatan susunan rod dalam lapis tipis. Energi celah pita lapis tipis ZnO nanorod yang disintesis berkisar antara 3,69-3,79 eV.

Vertically oriented ZnO nanorods were prepared in a two steps technique involving the preparation of ZnO seed layer and the growth of well aligned ZnO nanorod by hydrothermal deposition method. The effect of post synthesis washing treatment and hydrothermal quenching were first studied to hinder over deposition on the surface of vertically alligned ZnO nanorods. Effect of the substrates orientation on the growth of ZnO nanorods was also investigated. The hydrothermal deposition was performed at various time of 20, 40, 60 and 120 minutes. The as-prepared ZnO nanorod thin film was characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and specular reflectance UV-Visible spectrophotometer. The results show that washing treatment and quenching process is an effective post treatments method to reduce and prevent the formation of ZnO nanorods with a random orientation. ZnO nanorods deposited hydrothermally on facing up glass substrate revealed longer rods than those deposited on facing down position. Diameter, length and density of the rod increased as hydrothermal time increased. Bandgap energy of the resulted ZnO nanorod thin films ranged from 3.69 to 3.79 eV.

Kata Kunci : ZnO nanorod, orientasi vertikal, hidrotermal, pencucian, posisi substrat, quenching, waktu hidrotermal