Nanoseed-assisted rapid formation of ultrathin ZnO nanorods for efficient room temperature NO 2 detection

Abstract The influence of ZnO nanoseeds on the formation of ZnO nanorods from e-Zn(OH)2 in NaOH solution at 80 °C was investigated, using ZnO nanoparticles with a diameter of 4–10 nm as the seeds. The experimental results indicated that the presence of ZnO nanoseeds promoted the rapid heterogeneous formation of ultrathin ZnO nanorods. Compared with the ZnO submicron rods with a diameter of 0.5–1.0 µm, the ultrathin ZnO nanorods with a diameter of 10–15 nm were found to be more sensitive for detecting NO2 at room temperature owing to their higher variation of channel conduction to the diameter.

[1]  E. Kim,et al.  From Zn(OH)2 to ZnO: a study on the mechanism of phase transformation , 2011 .

[2]  Kyung Soo Park,et al.  Gas sensing properties of defect-controlled ZnO-nanowire gas sensor , 2008 .

[3]  Y. Qiu,et al.  Electrochemical route to the synthesis of ultrathin ZnO nanorod/nanobelt arrays on zinc substrate , 2007 .

[4]  V. Dravid,et al.  Nanopatterned polycrystalline ZnO for room temperature gas sensing , 2010 .

[5]  C. Soci,et al.  ZnO nanowire UV photodetectors with high internal gain. , 2007, Nano letters.

[6]  Guanghou Wang,et al.  Structural, mechanical, and electronic properties of ultrathin ZnO nanowires , 2008 .

[7]  A. Bermak,et al.  A fast-response/recovery ZnO hierarchical nanostructure based gas sensor with ultra-high room-temperature output response , 2015 .

[8]  Chan Woong Na,et al.  Selective detection of NO2 and C2H5OH using a Co3O4-decorated ZnO nanowire network sensor. , 2011, Chemical communications.

[9]  Xiangyang Ma,et al.  Straight and thin ZnO nanorods: hectogram-scale synthesis at low temperature and cathodoluminescence. , 2006, The journal of physical chemistry. B.

[10]  Hailong Lu,et al.  Size Dependence of Gas Sensitivity of ZnO Nanorods , 2007 .

[11]  Ning Wang,et al.  Ultrathin ZnO nanorods: facile synthesis, characterization and optical properties , 2010, Nanotechnology.

[12]  Q. Qiao,et al.  Size-Controlled Synthesis and Optical Properties of Small-Sized ZnO Nanorods , 2009 .

[13]  Yueping Fang,et al.  Synthesis of ultrathin ZnO nanofibers aligned on a zinc substrate. , 2006, Small.

[14]  N. Katsarakis,et al.  Growth of c-axis oriented ZnO nanowires from aqueous solution: The decisive role of a seed layer for controlling the wires' diameter , 2009 .

[15]  Hao Zhang,et al.  Enhancing NO2 gas sensing performances at room temperature based on reduced graphene oxide-ZnO nanoparticles hybrids , 2014 .

[16]  Xianchun Liu,et al.  Seed-mediated synthesis of uniform ZnO nanorods in the presence of polyethylene glycol , 2004 .

[17]  M. Yin,et al.  Zinc oxide quantum rods. , 2004, Journal of the American Chemical Society.

[18]  L. Xiang,et al.  Formation of ZnO rods with varying diameters from ε-Zn(OH)2 , 2014 .

[19]  Ming Hu,et al.  Electrochemical deposition of ZnO nanostructures onto porous silicon and their enhanced gas sensing to NO2 at room temperature , 2014 .

[20]  David E. Williams,et al.  Tin dioxide gas sensors. Part 1.—Aspects of the surface chemistry revealed by electrical conductance variations , 1987 .

[21]  Y. Bando,et al.  ZnO nanoneedles with tip surface perturbations: Excellent field emitters , 2004 .

[22]  J. Dutta,et al.  Effect of seeded substrates on hydrothermally grown ZnO nanorods , 2009 .

[23]  S. Komarneni,et al.  Hierarchical ZnO Nanosheet-Nanorod Architectures for Fabrication of Poly(3-hexylthiophene)/ZnO Hybrid NO2 Sensor. , 2016, ACS applied materials & interfaces.

[24]  S. Mirdamadi,et al.  The effect of seed layer thickness on alignment and morphology of ZnO nanorods , 2011 .

[25]  L. Ley,et al.  Low-temperature growth and field emission of ZnO nanowire arrays , 2005 .

[26]  Song-Yeu Tsai,et al.  Visible Photoluminescence of Ultrathin ZnO Nanowire at Room Temperature , 2006 .

[27]  I-Tseng Tang,et al.  Effect of seed layer on the growth of well-aligned ZnO nanowires , 2009 .

[28]  Kyung Soo Park,et al.  On-chip fabrication of ZnO-nanowire gas sensor with high gas sensitivity , 2009 .

[29]  Wan‐Yu Wu,et al.  Effects of Seed Layer Characteristics on the Synthesis of ZnO Nanowires , 2009 .