scholarly journals Performance improvement of miniaturized ZnO nanowire accelerometer fabricated by refresh hydrothermal synthesis

2017 ◽  
Vol 4 (9) ◽  
pp. 170557 ◽  
Author(s):  
Sangho Song ◽  
Hyun Chan Kim ◽  
Jung Woong Kim ◽  
Debora Kim ◽  
Jaehwan Kim
Keyword(s):  
Hydrothermal Synthesis ◽  
Performance Improvement ◽  
Piezoelectric Layer ◽  
Copper Substrate ◽  
Zno Nanowires ◽  
Synthesis Methods ◽  
Zno Nanowire

Miniaturized accelerometers are necessary for evaluating the performance of small devices, such as haptics, robotics and simulators. In this study, we fabricated miniaturized accelerometers using well-aligned ZnO nanowires. The layer of ZnO nanowires is used for active piezoelectric layer of the accelerometer, and copper was chosen as a head mass. Seedless and refresh hydrothermal synthesis methods were conducted to grow ZnO nanowires on the copper substrate and the effect of ZnO nanowire length on the accelerometer performance was investigated. The refresh hydrothermal synthesis exhibits longer ZnO nanowires, 12 µm, than the seedless hydrothermal synthesis, 6 µm. Performance of the fabricated accelerometers was verified by comparing with a commercial accelerometer. The sensitivity of the fabricated accelerometer by the refresh hydrothermal synthesis is shown to be 37.7 pA g −1 , which is about 30 times larger than the previous result.

scholarly journals Selective oil/water filter paper via a scalable one-pot hydrothermal growth of ZnO nanowires

RSC Advances ◽  
2015 ◽  
Vol 5 (110) ◽  
pp. 91001-91005 ◽  
Author(s):  
Yi Chen ◽  
Li Liu ◽  
Hyun-Joong Chung ◽  
John A. Nychka
Keyword(s):  
Hydrothermal Synthesis ◽  
Filter Paper ◽  
Zno Nanowires ◽  
Hydrothermal Growth ◽  
Zno Nanowire ◽  
One Pot ◽  
Water Filter ◽  
Oil Water ◽  
Filter Papers

A scalable, one pot hydrothermal synthesis of ZnO nanowire converted commodity filter papers to efficient oil/water separators. The coated filter paper exhibited superhydrophilic and superoleophobic properties in ambient and underwater conditions.

scholarly journals Sol-Gel Synthesis of the Double Perovskite Sr2FeMoO6 by Microwave Technique

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3876
Author(s):  
Jesús Valdés ◽  
Daniel Reséndiz ◽  
Ángeles Cuán ◽  
Rufino Nava ◽  
Bertha Aguilar ◽  
...  
Keyword(s):  
Particle Size ◽  
Hydrothermal Synthesis ◽  
Microwave Radiation ◽  
Structural Characteristics ◽  
Sol Gel ◽  
Synthesis Method ◽  
Double Perovskite ◽  
Synthesis Methods ◽  
X Ray ◽  
Sol Gel Synthesis

The effect of microwave radiation on the hydrothermal synthesis of the double perovskite Sr2FeMoO6 has been studied based on a comparison of the particle size and structural characteristics of products from both methods. A temperature, pressure, and pH condition screening was performed, and the most representative results of these are herein presented and discussed. Radiation of microwaves in the hydrothermal synthesis method led to a decrease in crystallite size, which is an effect from the reaction temperature. The particle size ranged from 378 to 318 nm when pH was 4.5 and pressure was kept under 40 bars. According to X-ray diffraction (XRD) results coupled with the size-strain plot method, the product obtained by both synthesis methods (with and without microwave radiation) have similar crystal purity. The Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS) techniques showed that the morphology and the distribution of metal ions are uniform. The Curie temperature obtained by thermogravimetric analysis indicates that, in the presence of microwaves, the value was higher with respect to traditional synthesis from 335 K to 342.5 K. Consequently, microwave radiation enhances the diffusion and nucleation process of ionic precursors during the synthesis, which promotes a uniform heating in the reaction mixture leading to a reduction in the particle size, but keeping good crystallinity of the double perovskite. Precursor phases and the final purity of the Sr2FeMoO6 powder can be controlled via hydrothermal microwave heating on the first stages of the Sol-Gel method.

scholarly journals Microwave-Assisted vs. Conventional Hydrothermal Synthesis of MoS2 Nanosheets: Application towards Hydrogen Evolution Reaction

Crystals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1040 ◽  
Author(s):  
Getachew Solomon ◽  
Raffaello Mazzaro ◽  
Vittorio Morandi ◽  
Isabella Concina ◽  
Alberto Vomiero
Keyword(s):  
Hydrothermal Synthesis ◽  
Hydrothermal Method ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Current Density ◽  
Crystal Morphology ◽  
Synthesis Method ◽  
Synthesis Methods ◽  
Mos2 Nanosheets ◽  
Microwave Assisted

Molybdenum sulfide (MoS2) has emerged as a promising catalyst for hydrogen evolution applications. The synthesis method mainly employed is a conventional hydrothermal method. This method requires a longer time compared to other methods such as microwave synthesis methods. There is a lack of comparison of the two synthesis methods in terms of crystal morphology and its electrochemical activities. In this work, MoS2 nanosheets are synthesized using both hydrothermal (HT-MoS2) and advanced microwave methods (MW-MoS2), their crystal morphology, and catalytical efficiency towards hydrogen evolution reaction (HER) were compared. MoS2 nanosheet is obtained using microwave-assisted synthesis in a very short time (30 min) compared to the 24 h hydrothermal synthesis method. Both methods produce thin and aggregated nanosheets. However, the nanosheets synthesized by the microwave method have a less crumpled structure and smoother edges compared to the hydrothermal method. The as-prepared nanosheets are tested and used as a catalyst for hydrogen evolution results in nearly similar electrocatalytic performance. Experimental results showed that: HT-MoS2 displays a current density of 10 mA/cm2 at overpotential (−280 mV) compared to MW-MoS2 which requires −320 mV to produce a similar current density, suggesting that the HT-MoS2 more active towards hydrogen evolutions reaction.

Sulfuration–desulfuration reaction sensing effect of intrinsic ZnO nanowires for high-performance H2S detection

2015 ◽  
Vol 3 (12) ◽  
pp. 6330-6339 ◽  
Author(s):  
Haiyun Huang ◽  
Pengcheng Xu ◽  
Dan Zheng ◽  
Chuanzhao Chen ◽  
Xinxin Li
Keyword(s):  
Theoretical Analysis ◽  
Material Characterization ◽  
High Performance ◽  
Nanowire Array ◽  
Zno Nanowires ◽  
The Novel ◽  
Zno Nanowire ◽  
Trace Level ◽  
Designed Experiments ◽  
H2s Detection

This study presents a novel sulfuration–desulfuration sensing effect of an intrinsic (i.e., uncatalyzed) ZnO nanowire array for trace-level detection of H2S. The novel H2S sensing mechanism is clarified by specifically designed experiments, material characterization and theoretical analysis.

ZnO nanowire-integrated bio-microchips for specific capture and non-destructive release of circulating tumor cells

Nanoscale ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 1455-1463 ◽  
Author(s):  
Heng Cui ◽  
Qing Liu ◽  
Rui Li ◽  
Xiaoyun Wei ◽  
Yue Sun ◽  
...  
Keyword(s):  
Tumor Cells ◽  
Circulating Tumor Cells ◽  
Zno Nanowires ◽  
Zno Nanowire ◽  
Nano Structure ◽  
Non Destructive

We constructed ZnO-coated gear structure PDMS pillars microchips that simultaneously combine the advantages of a micro/nano-structure. The microchip is designed to sensitively capture and non-destructively release CTCs using ZnO nanowires.

scholarly journals Morphological and Optical Properties of Cobalt Ion-Modified ZnO Nanowires

Catalysts ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 614
Author(s):  
Seok Cheol Choi ◽  
Do Kyung Lee ◽  
Sang Ho Sohn
Keyword(s):  
Optical Properties ◽  
Hydrothermal Synthesis ◽  
Oxygen Vacancies ◽  
Morphological Changes ◽  
Zno Nanowires ◽  
Oxide Cluster ◽  
Co Doping ◽  
Co Concentration ◽  
Acetate Hydrate ◽  
Low Levels

In this study, we prepared cobalt (Co) ion-modified ZnO nanowires using hydrothermal synthesis with zinc acetate dehydrate and Co (II) acetate hydrate precursors in ethanol solutions. Their morphological and optical properties were investigated with varying Co precursor concentration. The morphological changes of the ZnO nanowires depended positively on the concentration of the Co precursor. The ZnO nanowires showed modified crystal orientations and nanostructure shapes depending on the Co concentration in the solutions. Variations in the optical properties of the Co ion-modified ZnO nanowires could be explained by the interaction of the Co ions with the band electrons, oxygen vacancies, and zinc interstitials. The overall growth and characteristics of ZnO nanowires synthesized in solutions containing low levels of Co ions were related to Co doping into the ZnO bulks. In solutions containing high levels of Co ions, these were additionally related to the Co oxide cluster.

Photoluminescence enhancement of ZnO nanowire arrays by atomic layer deposition of ZrO2 layers and thermal annealing

2016 ◽  
Vol 18 (24) ◽  
pp. 16377-16385 ◽  
Author(s):  
Yuan Zhang ◽  
Hong-Liang Lu ◽  
Tao Wang ◽  
Qing-Hua Ren ◽  
Hong-Yan Chen ◽  
...  
Keyword(s):  
Atomic Layer Deposition ◽  
Thermal Annealing ◽  
Atomic Layer ◽  
Zno Nanowires ◽  
Nanowire Arrays ◽  
Zno Nanowire ◽  
Ultraviolet Emission ◽  
Zno Nanowire Arrays ◽  
Layer Deposition ◽  
Photoluminescence Enhancement

The ultraviolet emission of ZnO nanowires was enhanced significantly after coating with thin ZrO2 layers and thermal annealing.

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