scholarly journals Hydrogen Adsorption Properties of Nano- and Microstructures of ZnO

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Rizwan Wahab ◽  
Farheen Khan ◽  
Naushad Ahmad ◽  
Hyung-Shik Shin ◽  
Javed Musarrat ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Low Temperature ◽  
Surface Area ◽  
Hydrogen Adsorption ◽  
Solution Process ◽  
Adsorption Properties ◽  
Thin Sheets ◽  
Wurtzite Phase ◽  
Adsorption Studies

Nanoparticles, microflowers, and microspheres of zinc oxide have been synthesized in a large quantity via solution process at low temperature and were tested for the hydrogen adsorption studies. The experiments were carried out using Sievert’s apparatus which resulted in highest hydrogen adsorption value for nanoparticles is ~1.220 wt%, whereas for microflower composed with thin sheets value reduced (~1.011 wt%) but in case of microspheres composed with nanoparticles having below one wt% (~0.966 wt%). The FE-SEM and XRD clarify that the obtained products are crystalline with wurtzite phase. Including morphological and crystalline characterization, the surface area of the prepared nano- and microstructures was observed with BET.

PERMEABILITY STUDIES: IV. SURFACE AREA MEASUREMENTS OF ZINC OXIDE AND POTASSIUM CHLORIDE POWDERS

1949 ◽  
Vol 27a (6) ◽  
pp. 207-212 ◽  
Author(s):  
J. C. Arnell
Keyword(s):  
Zinc Oxide ◽  
Low Temperature ◽  
Potassium Chloride ◽  
Surface Area ◽  
Satisfactory Agreement ◽  
Fine Powders ◽  
Zinc Oxides ◽  
Adsorption Data ◽  
Permeability Studies

The use of the modified Kozeny equation for the measurement of the specific surfaces of fine powders has been extended to include a number of standard zinc oxides and a sample of potassium chloride. The specific surfaces of the zinc oxides had been measured by 10 other methods, and the data are included for comparison. Comparative low temperature adsorption data for the potassium chloride are also given. Satisfactory agreement with other methods was found.

Influence of Oxide Doping on Co3O4-CeO2 for CO Oxidation

2011 ◽  
Vol 287-290 ◽  
pp. 1718-1722 ◽  
Author(s):  
Jian Xin Cai ◽  
Yi Hao Lv ◽  
Rong Bin Zhang ◽  
Lai Tao Luo
Keyword(s):  
Crystal Structure ◽  
Low Temperature ◽  
Specific Surface ◽  
Co Oxidation ◽  
Surface Area ◽  
Specific Surface Area ◽  
Catalytic Properties ◽  
Co Adsorption ◽  
Adsorption Properties ◽  
Adsorption Performance

Ce0.7M0.3CoOx catalysts were prepared by polyatomic alcohol method. The crystal structure, reduction and adsorption properties, and specific surface were investigated by XRD, TPR, TPD, BET, respectively. The results show that catalysts doped with different oxides can make great effects on the catalytic properties of the Co3O4-CeO2. The interaction between doping oxides (SrO, NiO, La2O3, ZrO2, Nd2O3) and Co3O4-CeO2 is contributed to the change of the reduction and adsorption performance, and specific surface area of the catalysts. SrO doping can promote CeO2 reduction, CO adsorption and low-temperature oxidative activity of the catalysts. The conversion of CO can reach 100% over the Ce0.7Sr0.3CoOx at 120 °C temperature.

Low Temperature, All-Inorganic Nanoparticle Solution Process for ZnO Nanowire Network Transistor Fabrication on a Polymer Substrate

2009 ◽  
Author(s):  
Seung Hwan Ko ◽  
Inkyu Park ◽  
Heng Pan ◽  
Nipun Misra ◽  
Costas P. Grigoropoulos
Keyword(s):  
Zinc Oxide ◽  
Low Temperature ◽  
Active Material ◽  
Solution Process ◽  
Metal Nanoparticle ◽  
Large Area ◽  
Nanowire Network ◽  
Flexible Polymer ◽  
Zinc Oxide Nanowire ◽  
Transistor Fabrication

All-solution processed, low-temperature zinc oxide nanowire network transistor fabrication was demonstrated by combining 1) source-drain electrode fabrication by direct nanoimprinting of metal nanoparticle solution and 2) zinc oxide nanowire network based channel synthesized by a simple hydrothermal approach in water. This simple process can produce high resolution metal contact transistors with inorganic semiconductor nanowire active material in a fully maskless sequence, eliminating the need for lithographic and vacuum processes. The temperature throughout the processing was under 140°C, which will enable further applications to electronics on low-cost, large-area flexible polymer substrates.

Synthesis and Hydrogen Adsorption Properties of Templated Nanoporous Carbons

2011 ◽  
Vol 239-242 ◽  
pp. 2116-2119
Author(s):  
Kai Sheng Xia ◽  
Qiu Ming Gao
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Hydrogen Adsorption ◽  
Adsorption Properties ◽  
Volumetric Method ◽  
Promising Candidate ◽  
Nanoporous Carbons ◽  
Silica Template ◽  
Structural Characterizations

Four nanoporous carbons have been synthesized by using similar silica template method. The structural characterizations showed that the carbons retained ordered hexagonal or cubic pore structure expect for disordered CS41, which was prepared using MCM-41 as template. Nitrogen adsorptions at 77 K revealed that carbons with different pore size distribution, specific surface area and pore volume were obtained. The hydrogen adsorption capacity was measured by volumetric method, and the most promising candidate resulted to be microporous carbon CS41, which exhibited the highest H2uptake of 1.17 wt % at 77 K and 1 bar. The capacities of hydrogen adsorbed in the nanoporous carbons were correlated with specific surface area and microporous volume. The result demonstrated that the H2uptake in the carbons had essential relationship with volume of pores smaller than 1 nm.

scholarly journals Rapid Growth of TiO2 Nanoflowers via Low-Temperature Solution Process: Photovoltaic and Sensing Applications

Materials ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 566 ◽  
Author(s):  
M. Akhtar ◽  
Ahmad Umar ◽  
Swati Sood ◽  
InSung Jung ◽  
H. Hegazy ◽  
...  
Keyword(s):  
Low Temperature ◽  
Anatase Phase ◽  
Three Dimensional ◽  
Solution Process ◽  
Dye Sensitized Solar Cell ◽  
Sensor Applications ◽  
Dye Sensitized ◽  
Sensing Applications ◽  
Density Growth ◽  
Temperature Solution

This paper reports the rapid synthesis, characterization, and photovoltaic and sensing applications of TiO2 nanoflowers prepared by a facile low-temperature solution process. The morphological characterizations clearly reveal the high-density growth of a three-dimensional flower-shaped structure composed of small petal-like rods. The detailed properties confirmed that the synthesized nanoflowers exhibited high crystallinity with anatase phase and possessed an energy bandgap of 3.2 eV. The synthesized TiO2 nanoflowers were utilized as photo-anode and electron-mediating materials to fabricate dye-sensitized solar cell (DSSC) and liquid nitroaniline sensor applications. The fabricated DSSC demonstrated a moderate conversion efficiency of ~3.64% with a maximum incident photon to current efficiency (IPCE) of ~41% at 540 nm. The fabricated liquid nitroaniline sensor demonstrated a good sensitivity of ~268.9 μA mM−1 cm−2 with a low detection limit of 1.05 mM in a short response time of 10 s.

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