scholarly journals Fabrication of Novel 2D NiO Nanosheet Branched on 1D-ZnO Nanorod Arrays for Gas Sensor Application

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Le Thuy Hoa ◽  
Huynh Ngoc Tien ◽  
Seung Hyun Hur
Keyword(s):  
Carrier Transport ◽  
Gas Adsorption ◽  
Low Cost ◽  
Zno Nanorods ◽  
Hydrothermal Process ◽  
Large Area ◽  
Highly Sensitive ◽  
P Type ◽  
Reducing Gases ◽  
Nio Nanosheets

Fabrication of 3D structures composed of 1D n-type ZnO nanorods (NRs) and 2D p-type NiO nanosheets (NSs) by a low-cost, low-temperature, and large-area scalable hydrothermal process and its use in highly sensitive NO2gas sensors were studied. The p-n heterojunctions formed by NiO-ZnO interfaces as well as large area two-dimensional NiO NSs themselves increased the adsorption of NO2. Moreover, the charge transfer between NiO and ZnO enhanced the responsivity and sensitivity of NO2sensing even at a concentration of 1 ppm. The 30-min NiO NS growth on ZnO NRs in the hybrid sensor showed the highest sensitivity due to the formation of optimum p-n heterojunctions between ZnO NRs and NiO NSs for gas adsorption and carrier transport. Low responsivity toward reducing gases was also observed.

Fabricaton Ofactive Devices and Logic Gates on Fibers

2003 ◽  
Vol 769 ◽  
Author(s):  
YongWoo Choi ◽  
Ioannis Kymissis ◽  
Annie Wang ◽  
Akintunde I. Akinwande
Keyword(s):  
Threshold Voltage ◽  
Electronic Structures ◽  
Low Cost ◽  
Logic Gates ◽  
Wearable Electronics ◽  
Drain Voltage ◽  
Large Area ◽  
Active Devices ◽  
P Type ◽  
A Current

AbstractTextiles are a suitable substrate for large area, flexible and wearable electronics because of their excellent flexibility, mechanical properties and low cost manufacturability. The ability to fabricate active devices on fiber is a key step for achieving large area and flexible electronic structures. We fabricated transistors and inverters with a-Si film and pentacene film on Kapton film and cut them into fibers. The a-Si TFT showed a threshold voltage of 8.5 V and on/off ratio of 103 at a drain voltage of 10 V. These are similar to the characteristics of a TFT fabricated on a glass substrate at the same time. The maximum gain of the inverter with an enhancement n-type load was 6.45 at a drain voltage of 10 V. The pentacene OTFT showed a threshold voltage of -8 V and on/off ratio of 103 at a drain voltage of -30 V. The inverter with a depletion p-type load showed a voltage inversion but the inversion occurred at the wrong voltage. The antifuse was successfully programmed with a voltage pulse and also a current pulse. The resistance decreased from 10 GΩ to 2 kΩ after the programming.

Incorporation of Sb in ZnO Nanostructures Through Hydrothermal Process

2008 ◽  
Vol 8 (12) ◽  
pp. 6551-6557 ◽  
Author(s):  
A. Escobedo Morales ◽  
U. Pal ◽  
M. Herrera Zaldivar
Keyword(s):  
Optical Band Gap ◽  
Catalytic Effect ◽  
Low Cost ◽  
Zno Nanorods ◽  
Hydrothermal Process ◽  
Semiconductor Nanostructures ◽  
Zno Nanostructures ◽  
High Concentration ◽  
Heavy Doping ◽  
Chemical Techniques

Incorporation of dopants in optoelectronic semiconductor nanostructures has been a matter of great interest in recent times. While such doping has been performed almost routinely using physical methods, use of low-cost chemical techniques for that purpose is still rare. We incorporated antimony in zinc oxide (ZnO) nanostructures through a low temperature hydrothermal method. In as-grown nanostructures, antimony remains partially in Sb2O3 phase. On thermal annealing at 500 °C, it dissociates and antimony incorporates into ZnO mainly by substituting zinc from the crystal lattice. Incorporation of Sb drastically modifies the morphology of the ZnO nanostructures. While incorporation of Sb in low concentration promotes the formation of uniform prismatic ZnO nanorods probably due to catalytic effect, high concentration of Sb causes the formation of rounded shaped nanoparticles due to high interfacial compressive stress. Incorporated Sb in the ZnO nanostructures remains inhomogeneously distributed. The optical band gap of the ZnO nanostructures increases a bit for lightly doped samples but it decreases for heavy doping.

scholarly journals Mace-like carbon fibers/ZnO nanorods composites derived from Typha orientalis as ultralight and high-performance electromagnetic wave absorber

2021 ◽  
Author(s):  
Yanyan Dong ◽  
Xiaojie Zhu ◽  
Fei Pan ◽  
Baiwen Deng ◽  
Zhicheng Liu ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Low Cost ◽  
Zno Nanorods ◽  
Hydrothermal Process ◽  
Hollow Structure ◽  
Filling Ratio ◽  
Impedance Match ◽  
Typha Orientalis

Abstract Inspired by the nature, biomass-derived carbon attracts many attentions as the electromagnetic wave absorption (EMA) material owing to its advantages including abundant, low cost, renewable and environmentally friendly. However, it is difficult to make further breakthrough in effective absorption bandwidth (EAB) due to the impedance mismatch. In this work, mace-like carbon fibers/ZnO nanorods composites (BDCFs@ZnO) derived from Typha orientalis were prepared via a carbonization process and a subsequent hydrothermal process for the first time. The unique hollow structure of BDCFs and the construction of 3D interconnected conductive network led to the strong conduction loss and multiple reflection. The BDCFs sample possesses an excellent EMA performance with an ultralow filling ratio of only 5wt%. After directionally growing of the ZnO nanorods, an exceptional RL of -62.35 dB at 14.12 GHz and the EAB achieves 6.8 GHz at the thickness of 2.29 mm at a filling ratio of 15wt% were revealed. Mace-like ZnO with suitable permittivity effectively avoid the reflection result from direct contraction between EMW and carbon fiber, further improving impedance match. Simultaneously, a dielectric sum-quotient model was proposed to analyze the EMA performance of the samples. This work not only offers an inspiration for the development of dielectric loss-type EMA materials with lightweight and strong EMA performance by a sustainable, low-cost and easily available approach, but also provides an important strategy toward biomass-derived carbon-fiber-based composites in other fields.

Highly Sensitive Picric Acid Chemical Sensor Based on Samarium (Sm) Doped ZnO Nanorods

2019 ◽  
Vol 19 (6) ◽  
pp. 3637-3642 ◽  
Author(s):  
Yas Al-Hadeethi ◽  
Ahmad Umar ◽  
Kulvinder Singh ◽  
Ahmed A Ibrahim ◽  
Saleh. H Al-Heniti ◽  
...  
Keyword(s):  
Large Scale ◽  
Chemical Sensor ◽  
Limit Of Detection ◽  
Picric Acid ◽  
Zno Nanorods ◽  
Hydrothermal Process ◽  
High Sensitivity ◽  
Highly Sensitive ◽  
Doped Zno ◽  
Facile Hydrothermal Process

Herein, we report the synthesis, characterization and picric acid chemical sensing application of samarium (Sm) doped ZnO nanorods. The Sm-doped ZnO nanorods were synthesized by facile hydrothermal process and characterized using various analytical methods which confirmed the large-scale synthesis and wurtzite hexagonal crystal structure for the synthesized nanorods. The doping of Sm ions in the lattices of the synthesized nanorods was evaluated by the energy dispersive X-ray spectroscopy (EDS). The synthesized Sm-doped ZnO nanorods were used as potential scaffold to fabricate high sensitive and reproducible picric acid chemical sensor based on I–V technique. The fabricated picric acid chemical sensor based on Sm-doped ZnO nanorods exhibited a high sensitivity of 213.9 mA mM−1 cm−2 with the limit of detection of ∼0.228 mM and correlation coefficient of R═0.9889. The obtained results revealed that the facile grown Sm-doped ZnO nanorods can efficiently be used to fabricate high sensitive and reproducible chemical sensors.

scholarly journals Conformally Gated Surface Conducting Behaviors of Single-Walled Carbon Nanotube Thin-Film-Transistors

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3361
Author(s):  
Kyung-Tae Kim ◽  
Keon Woo Lee ◽  
Sanghee Moon ◽  
Joon Bee Park ◽  
Chan-Yong Park ◽  
...  
Keyword(s):  
Field Effect ◽  
Carrier Transport ◽  
Field Effect Transistors ◽  
Low Cost ◽  
Cost Effective ◽  
Electrical Performance ◽  
Solution Synthesis ◽  
Large Area ◽  
Element Analysis ◽  
Single Walled Carbon

Semiconducting single-walled carbon nanotubes (s-SWCNTs) have gathered significant interest in various emerging electronics due to their outstanding electrical and mechanical properties. Although large-area and low-cost fabrication of s-SWCNT field effect transistors (FETs) can be easily achieved via solution processing, the electrical performance of the solution-based s-SWCNT FETs is often limited by the charge transport in the s-SWCNT networks and interface between the s-SWCNT and the dielectrics depending on both s-SWCNT solution synthesis and device architecture. Here, we investigate the surface and interfacial electro-chemical behaviors of s-SWCNTs. In addition, we propose a cost-effective and straightforward process capable of minimizing polymers bound to s-SWCNT surfaces acting as an interfering element for the charge carrier transport via a heat-assisted purification (HAP). With the HAP treated s-SWCNTs, we introduced conformal dielectric configuration for s-SWCNT FETs, which are explored by a carefully designed wide array of electrical and chemical characterizations with finite-element analysis (FEA) computer simulation. For more favorable gate-field-induced surface and interfacial behaviors of s-SWCNT, we implemented conformally gated highly capacitive s-SWCNT FETs with ion-gel dielectrics, demonstrating field-effect mobility of ~8.19 cm2/V⋅s and on/off current ratio of ~105 along with negligible hysteresis.

FABRICATION OF LARGE-AREA SILICON NANOWIRE ARRAYS FOR SOLAR CELLS

2012 ◽  
Vol 11 (06) ◽  
pp. 1240026
Author(s):  
WUXING LAI ◽  
GUOQIANG XU ◽  
WEI ZHANG ◽  
TIELIN SHI
Keyword(s):  
Solar Cells ◽  
Aspect Ratio ◽  
Silicon Wafer ◽  
Low Cost ◽  
Silicon Nanowire ◽  
Large Area ◽  
Water Contact ◽  
Potential Implication ◽  
Silicon Nanowire Arrays ◽  
P Type

In this paper, a simple, low-cost and efficient method was adopted to fabricate large-area Si nanowire ( SiNW ) arrays by inserting the p-type (100) silicon wafer into aqueous HF + AgNO3 solution for a certain time at room temperature. Surface of the silicon wafer with high aspect ratio SiNW shows the characteristics of low-reflection as low as 5% in the 450–800 nm wavelength range, especially less than 1% after etching for 60 min. The surface also exhibits super-hydrophobicity with water contact angle up to 150°. We investigated the relationship between the etching duration and aspect ratio of the SiNW systematically and demonstrated that the aspect ratio of the SiNW can be controlled. The antireflection surface shows a potential implication in increasing the conversation efficiency for solar cells, and the self-cleaning properties will further enhance the resistance to environment conditions for a long-life work.

Preparation of FePO4•2H2O with Flower-like Microstructure by a Facile Hydrothermal Synthesis Method

2013 ◽  
Vol 423-426 ◽  
pp. 550-553 ◽  
Author(s):  
Bing Jiang ◽  
Wen Qin Wang ◽  
Yu Song Liu ◽  
Zhi Meng Guo
Keyword(s):  
Reaction Time ◽  
Hydrothermal Synthesis ◽  
Formation Mechanism ◽  
Low Cost ◽  
Hydrothermal Process ◽  
Synthesis Method ◽  
Large Area ◽  
Facile Hydrothermal Process

FePO4·2H2O with orthorhombic flower-like microstructure was synthesized by a facile hydrothermal process which was of low-cost and easy processing in large area. The formation mechanism of the flower-like FePO4·2H2O was discussed in details by investigating the different concentration of reactants and reaction time. The results show that the morphology of FePO4·2H2O changed from microsphere to flower-like structure, which possess an unique morphology with six petals and the angle of each petal being 60o. The formation mechanism of FePO4·2H2O flowers can be explained by the dissolution-recrystallization and crystal splitting.

scholarly journals Highly Sensitive Magnesium-Doped ZnO Nanorod pH Sensors Based on Electrolyte–Insulator–Semiconductor (EIS) Sensors

Sensors ◽  
2021 ◽  
Vol 21 (6) ◽  
pp. 2110
Author(s):  
Ensaf Mohammed Al-Khalqi ◽  
Muhammad Azmi Abdul Hamid ◽  
Naif H. Al-Hardan ◽  
Lim Kar Keng
Keyword(s):  
Zno Nanorods ◽  
Hydrothermal Process ◽  
Magnesium Content ◽  
Hydroxyl Group ◽  
Zno Nanorod ◽  
Ph Sensing ◽  
High Hydrogen ◽  
Surface Hydroxyl ◽  
Highly Sensitive ◽  
The Impact

For highly sensitive pH sensing, an electrolyte insulator semiconductor (EIS) device, based on ZnO nanorod-sensing membrane layers doped with magnesium, was proposed. ZnO nanorod samples prepared via a hydrothermal process with different Mg molar ratios (0–5%) were characterized to explore the impact of magnesium content on the structural and optical characteristics and sensing performance by X-ray diffraction analysis (XRD), atomic force microscopy (AFM), and photoluminescence (PL). The results indicated that the ZnO nanorods doped with 3% Mg had a high hydrogen ion sensitivity (83.77 mV/pH), linearity (96.06%), hysteresis (3 mV), and drift (0.218 mV/h) due to the improved crystalline quality and the surface hydroxyl group role of ZnO. In addition, the detection characteristics varied with the doping concentration and were suitable for developing biomedical detection applications with different detection elements.

scholarly journals Flexible piezocapacitive sensors based on wrinkled microstructures: toward low-cost fabrication of pressure sensors over large areas

RSC Advances ◽  
2017 ◽  
Vol 7 (63) ◽  
pp. 39420-39426 ◽  
Author(s):  
Seolhee Baek ◽  
Hayeong Jang ◽  
So Young Kim ◽  
Heejeong Jeong ◽  
Singu Han ◽  
...  
Keyword(s):  
Low Cost ◽  
Pressure Sensors ◽  
Large Area ◽  
Highly Sensitive

Wrinkled elastomeric templates prepared by stretching and releasing are utilized for demonstrating highly sensitive, simple, and low-cost piezocapacitive pressure sensors over large area.

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