Porous and single-crystalline ZnO nanobelts: fabrication with annealing precursor nanobelts, and gas-sensing and optoelectronic performance

Abstract

Porous and single-crystalline ZnO nanobelts have been prepared through annealing precursors of ZnSe · 0.5N2H4 well-defined and smooth nanobelts, which have been synthesized via a simple hydrothermal method. The composition and morphology evolutions with the calcination temperatures have been investigated in detail for as-prepared precursor nanobelts, suggesting that they can be easily transformed into ZnO nanobelts by preserving their initial morphology via calcination in air. In contrast, the obtained ZnO nanobelts are densely porous, owing to the thermal decomposition and oxidization of the precursor nanobelts. More importantly, the achieved porous ZnO nanobelts are single-crystalline, different from previously reported ones. Motivated by the intrinsic properties of the porous structure and good electronic transporting ability of single crystals, their gas-sensing performance has been further explored. It is demonstrated that porous ZnO single-crystalline nanobelts exhibit high response and repeatability toward volatile organic compounds, such as ethanol and acetone, with a short response/recovery time. Furthermore, their optoelectronic behaviors indicate that they can be promisingly employed to fabricate photoelectrochemical sensors.

Porous Single‐Crystalline CdSe Nanobelts: Cation‐Exchange Synthesis and Highly Selective Photoelectric Sensing toward Cu2+

“…Cation‐exchange synthesis of the porous single‐crystalline CdSe nanobelts : The porous single‐crystalline CdSe nanobelts were prepared as follows. Ultrathin ZnSe⋅0.5 N 2 H 4 nanobelts, which served as the precursors, were first synthesized according to our previously reported approach . Afterwards, the as‐synthesized ZnSe⋅0.5 N 2 H 4 nanobelts (0.2 mmol) were dispersed in the aqueous solution, which contained a certain amount of poly(vinylpyrrolidone) (PVP, K30), to form a homogenous solution (14 mL).…”

Negative Effects of Annealed Seed Layer on the Performance of ZnO-Nanorods Based Nitric Oxide Gas Sensor

“…Metal oxide semiconductors-based gas sensing mechanisms and phenomena have been widely discussed. However, there are still some possible and widely accepted interpretations [ 29 , 30 , 31 ]. During the gas sensing process, the oxygen vacancy on the surface of the material has a greater activity, the gas molecules are attached to the vacant oxygen position and its change influence the electrical analysis [ 32 ].…”

Changing the Blood Test: Accurate Determination of Mercury(II) in One Microliter of Blood Using Oriented ZnO Nanobelt Array Film Solution‐Gated Transistor Chips

“…A belt‐like morphology of the ZnSe·0.5N 2 H 4 precursor is clearly observed (Figure S1a, Supporting Information); the length is up to several micrometers. A typical single ZnO‐NB is shown in Figure S1b (Supporting Information) . The thickness of a single ZnO‐NB was investigated by atomic force microscopy (AFM) ( Figure a,b).…”

“…Assembly of Ordered ZnO‐NB Films : ZnO‐NBs were obtained by annealing the precursors (ZnSe·0.5N 2 H 4 ) in air. The precursors were synthesized via a typical hydrothermal method according to the previous report, and the ordered precursor‐nanobelt film was prepared by the L–B technique . Briefly, a homemade trough was filled with deionized water until the settled substrate was flooded.…”