Synthesis of self-bridged ZnO nanowires and their humidity sensing properties

Park, Soobin; Lee, Dongik; Kwak, Byungkwan; Lee, Han-Seung; Lee, Songjun; Yoo, Bongyoung

doi:10.1016/j.snb.2018.04.118

Cited by 45 publications

(16 citation statements)

References 28 publications

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“…In general, ceramics, semi-conductive metal oxides, polymers, and carbon-based nanomaterials are the most common sensitive materials [8,9,10,11]. Among them, metal oxide semiconductor materials such as ZnO, TiO 2 , CuO, and Al 2 O 3 are widely used for sensor development due to their simple fabrication, high sensing response, good operational stability, low cost, and good portability [12,13,14,15]. Among them, ZnO has become widely studied as a nano-sensing material because it is plentiful and has controllable surface morphology, wide resistivity range, good chemical stability, and thermal stability [15,16].…”

Section: Introductionmentioning

confidence: 99%

Effects of pH on High-Performance ZnO Resistive Humidity Sensors Using One-Step Synthesis

Zhang

et al. 2019

Sensors

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In this paper, we prepared a high-performance zinc oxide (ZnO) humidity sensor in an alkaline environment using one-step hydrothermal method. Experiments showed that the pH value of the precursor solution affects the performance of ZnO humidity sensors. There are abundant hydroxyl group and oxygen vacancies on the surface of ZnO with a precursor pH value of 10. Abundant hydroxyl groups on the surface of ZnO can adsorb a large number of water molecules and rich oxygen vacancies can accelerate the decomposition of water molecules, thus increasing the number of conductive ions (H3O+) and further improving the performance of the sensor. So, such a ZnO humidity sensor exhibited high sensitivity (14,415), good linearity, small hysteresis (0.9%), fast response/recovery time (31/15 s) in the range from 11% to 95% relative humidity (RH). Moreover, the ZnO-2 humidity sensor has good repeatability and can be effectively used for a long time. This study provides a new idea for the development of low-cost, high-performance and reusable ZnO resistive humidity sensors.

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Section: Introductionmentioning

confidence: 99%

Effects of pH on High-Performance ZnO Resistive Humidity Sensors Using One-Step Synthesis

Zhang

et al. 2019

Sensors

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“…So, we expect that the one-dimensional (1D) nanowires can provide a much higher surface area, as compared to thin film or bulk materials. As reported for the 1D nanowire arrays, the number of surface active sites for the absorption of water molecules increases, resulting in the overall change of the sensing conduction and increase of the humiditysensitive characteristic of the sensor [22][23][24][25].…”

Section: Introductionmentioning

confidence: 58%

Aligned Grid Shaped NiO Nanowires for Humidity Sensing at Room Temperature

Mohammadi

Almasi-Kashi

Fardindoost

et al. 2020

Preprint

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A grid configuration based on the aligned nickel oxide nanowire (NiO NW) for humidity sensing were fabricated through the oxidation of ferromagnetic nickel NWs prepared by a template-assisted electrodeposition process. Their structure and elemental compositions were characterized by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), and energy-dispersive X-ray analyses (EDAX). The room-temperature humidity sensing behavior of the NiO NWs was investigated successfully based on DC and AC impedance spectroscopy (IS) method in frequencies range 10 Hz to 2 MHz. The sensors showed excellent humidity sensing characteristics such as a high response of about 66 with rather rapid response-recovery times about 9 and 2 s for 90%RH, and good stability. The equivalent circuits were simulated for impedance responses to humidity in the range of 40–90% RH. According to the results, ionic conduction via NW-NW junctions as well as NW-electrode interfaces in the grid configuration is responsible for sensing behavior.

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“…In optoelectronics, various ZnO nanostructures are used for producing e.g., refractive index sensors [ 123 ], surface-enhanced Raman scattering (SERS) sensors [ 124 ], lasers, UV detectors, and UV diodes [ 74 , 125 , 126 , 127 , 128 ]. ZnO nanostructures may serve for producing sensors of gases [ 129 , 130 , 131 , 132 , 133 , 134 , 135 , 136 , 137 , 138 , 139 , 140 , 141 , 142 , 143 , 144 , 145 , 146 , 147 , 148 , 149 , 150 , 151 , 152 ] such as steam (humidity, H 2 O) [ 133 ], ammonia (NH 3 ) [ 129 , 130 , 131 , 143 ], nitrogen (N 2 ) [ 131 ], nitrogen monoxide (NO) [ 129 , 130 , 139 ], nitrogen dioxide (NO 2 ) [ 129 , 131 , 134 , 135 , 136 ,…”

Section: Introductionmentioning

confidence: 99%

A Review of Microwave Synthesis of Zinc Oxide Nanomaterials: Reactants, Process Parameters and Morphologies

2020

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Zinc oxide (ZnO) is a multifunctional material due to its exceptional physicochemical properties and broad usefulness. The special properties resulting from the reduction of the material size from the macro scale to the nano scale has made the application of ZnO nanomaterials (ZnO NMs) more popular in numerous consumer products. In recent years, particular attention has been drawn to the development of various methods of ZnO NMs synthesis, which above all meet the requirements of the green chemistry approach. The application of the microwave heating technology when obtaining ZnO NMs enables the development of new methods of syntheses, which are characterised by, among others, the possibility to control the properties, repeatability, reproducibility, short synthesis duration, low price, purity, and fulfilment of the eco-friendly approach criterion. The dynamic development of materials engineering is the reason why it is necessary to obtain ZnO NMs with strictly defined properties. The present review aims to discuss the state of the art regarding the microwave synthesis of undoped and doped ZnO NMs. The first part of the review presents the properties of ZnO and new applications of ZnO NMs. Subsequently, the properties of microwave heating are discussed and compared with conventional heating and areas of application are presented. The final part of the paper presents reactants, parameters of processes, and the morphology of products, with a division of the microwave synthesis of ZnO NMs into three primary groups, namely hydrothermal, solvothermal, and hybrid methods.

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Synthesis of self-bridged ZnO nanowires and their humidity sensing properties

Cited by 45 publications

References 28 publications

Effects of pH on High-Performance ZnO Resistive Humidity Sensors Using One-Step Synthesis

Effects of pH on High-Performance ZnO Resistive Humidity Sensors Using One-Step Synthesis

Aligned Grid Shaped NiO Nanowires for Humidity Sensing at Room Temperature

A Review of Microwave Synthesis of Zinc Oxide Nanomaterials: Reactants, Process Parameters and Morphologies

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