Aspect Ratio Dependence of the Elastic Properties of ZnO Nanobelts

Abstract

The Young's modulus of ZnO nanobelts was measured with an atomic force microscope by means of the modulated nanoindentation method. The elastic modulus was found to depend strongly on the width-to-thickness ratio of the nanobelt, decreasing from about 100 to 10 GPa, as the width-to-thickness ratio increases from 1.2 to 10.3. This surprising behavior is explained by a growth-direction-dependent aspect ratio and the presence of stacking faults in nanobelts growing along particular directions.

Arrays of nanorods composed of ZnO nanodots exhibiting enhanced UV emission and stability

“…The very recent literature contains several reports of NRs (and nanotubes) decorated by NDs and their possible application in quantum dot-sensitized solar cells, 15 in photocatalysts, 16 in bio-sensing 17 and in singlephoton sources. 18 The family of nanoscale zinc oxide (ZnO) structures, including ZnO nanorods/nanowires, [19][20][21][22] nanotubes, 23 nanobelts 24 and nanodots, 25 has stimulated huge interest over the last decade. [26][27][28] ZnO NDs have attracted particular attention, given their size and possible quantum confinement effects, and have shown performance in light emission devices 29,30 and in cell labeling.…”

Growth and characterization of ZnO needles

“…Various methods, such as precipitation (Lee et al 2002), sol-gel (Rani et al 2008), vapor-liquid-solid (VLS) growth (Ham et al 2005), chemical vapor deposition (CVD) (Zeng and Ye 2005), thermal decomposition (Zhao et al 2007), metal organic vapor-phase epitaxy (Li et al 2000), have been developed for controlling ZnO structures, since its various properties strongly depend on its structures including the crystal size, orientation, morphology, aspect ratio and even crystalline density. Currently, many interesting ZnO nanostructures including nanorods (Lucas and Mai 2007), nanowires (Xiang et al 2007), tetrapods (Chen et al 2007), nanocombs (Li et al 2008), nanotubes (Anas and Mangalaraja 2010), nanopencils (Shen et al 2006) and star-like (Peng et al 2010) have been successfully synthesized. In this letter, we presented a simple vapor-phase transport method approach to fabricate ZnO needles.…”

Morphology dependence of radial elasticity in multiwalled boron nitride nanotubes

“…Here, we use the AFM based modulated nanoindentation (MoNI) technique [16,24] (Fig. 1(a) vestigate the radial stiffness of individual CVD grown MW BN-NTs with radii ranging between 3.7 and 36 nm, and with a wall thickness approximately equal to 0.5 times the external radius, R ext , as obtained by the statistical TEM analysis shown in Fig.…”