Self-Assembly of Densely Packed ZnO Nanorods Grown Chemically on Porous Silicon Substrate

Abstract

<em><span style="font-size: 10.0pt; font-family: 'Times New Roman','serif'; mso-fareast-font-family: Calibri; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;">Self-assembly of densely packed ZnO nanorods were grown on Porous Silicon (PS) substrate by low-temperature chemical bath deposition. The structural and optical properties of the obtained ZnO nanostructures on PS substrate were systematically studied. The strong and <span style="letter-spacing: -.3pt;">sharp (002) peak </span></span><span style="font-size: 10.0pt; font-family: 'Times New Roman','serif'; mso-fareast-font-family: 'Times New Roman'; letter-spacing: -.3pt; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA; mso-no-proof: yes;">compared with other peaks</span><span style="font-size: 10.0pt; font-family: 'Times New Roman','serif'; mso-fareast-font-family: Calibri; letter-spacing: -.3pt; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;"> in the X-Ray Diffraction (XRD) indicated that</span><span style="font-size: 10.0pt; font-family: 'Times New Roman','serif'; mso-fareast-font-family: Calibri; letter-spacing: -.3pt; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;">ZnO nanorods</span><span style="font-size: 10.0pt; font-family: 'Times New Roman','serif'; mso-fareast-font-family: Calibri; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;"> formed with superior orientation toward the (002) plan.</span><span style="font-size: 10.0pt; font-family: 'Times New Roman','serif'; mso-fareast-font-family: Calibri; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;">In addition, the small crystallite size and low compressive strain revealed that the self-assembly of densely packed ZnO nanorods had good crystallinity. Field-Emission Scanning Electron Microscopy (FESEM) indicated that the <span style="letter-spacing: -.2pt;">self-assembly of densely packed ZnO nanorods occurred on the surface, inside the pores and on the pore </span>walls of the PS substrate. FESEM images indicated that the average diameter and length of the ZnO nanorods were 150 and 500 nm, respectively. Photoluminescence spectra (PL) exhibited a strong, sharp UV emission peak at 369 nm.</span></em>