Relative Humidity Sensing Studies of WO3-ZnO Nanocomposite

2009 ◽  
Vol 79-82 ◽  
pp. 365-368 ◽  
Author(s):  
N.K. Pandey ◽  
A. Tripathi ◽  
Dr.Karunesh Tiwari ◽  
Akash Roy
Keyword(s):  
Solid State ◽  
Relative Humidity ◽  
Solid State Reaction ◽  
Weight Ratio ◽  
Sensing Element ◽  
Humidity Sensing ◽  
Control Cabinet ◽  
Sem Micrograph ◽  
Relative Humidity Range ◽  
Humidity Range

Paper reports morphological and humidity sensing studies of WO3 and WO3-ZnO nanocomposite pellets prepared in the weight % ratio of 10:1, 4:1 and 2:1 by solid-state reaction route. The pellets have been annealed at temperatures of 300-500°C. XRD pattern shows peaks of ZnWO4 formed due to solid state reaction between WO3 and ZnO. SEM micrographs show that the sensing elements manifest porous structure. Granulation and tendency to agglomerate seen in the SEM micrograph are due to the presence of zinc ions in ZnWO4. Nanoparticles are having their sizes in the range 37-182 nm. The average Kelvin radius at 20°C room temperature is 27 Ả. Humidity sensing application of the pellets has been studied in a humidity control cabinet. It is observed that as relative humidity increases, there is decrease in the resistance of pellets in the range 10-85% RH. Sensing element of WO3-ZnO in 2:1 weight % ratio shows best results in 10-85 % relative humidity range. The average sensitivity of this sample is 1.20 MΩ/%RH. This sensing element shows good reproducibility, low hysteresis and less effect of aging.

Characterization and Humidity Sensing Application of ZnO-TiO2 Nanocomposite

2011 ◽  
Vol 304 ◽  
pp. 48-52 ◽  
Author(s):  
Narendra Kumar Pandey ◽  
Karunesh Tiwari ◽  
Akash Roy
Keyword(s):  
Relative Humidity ◽  
Electronic Conduction ◽  
Nanocomposite Powder ◽  
Sensing Element ◽  
Reaction Route ◽  
Humidity Sensing ◽  
Humidity Resistance ◽  
Sem Micrograph ◽  
Relative Humidity Range ◽  
Humidity Range

Paper reports morphological and relative humidity sensing studies of ZnO-TiO2nanocomposite powder pellets obtained through solid-state reaction route. When exposed to humidity, resistance of pellets decreases with increase in relative humidity from 10-90%. Sensing element with 15 weight % of TiO2in ZnO shows best results with maximum sensitivity of 9.08 MΩ/%RH in 10-90% relative humidity range. This sensing element manifests smallest crystallite size of 71 nm as measured from XRD and lowest grain size of 207 nm calculated from SEM micrograph. This sensing element has the lowest value of activation energy, and hence higher electronic conduction.

scholarly journals Highly sensitive, room temperature operated gold nanowire-based humidity sensor: adoptable for breath sensing

RSC Advances ◽  
2022 ◽  
Vol 12 (2) ◽  
pp. 1157-1164
Author(s):  
Parag V. Adhyapak ◽  
Aishwarya M. Kasabe ◽  
Amruta D. Bang ◽  
Jalindar Ambekar ◽  
Sulabha K. Kulkarni
Keyword(s):  
Relative Humidity ◽  
Room Temperature ◽  
Humidity Sensor ◽  
Gold Nanowire ◽  
Humidity Sensing ◽  
Highly Sensitive ◽  
Resistive Sensor ◽  
Relative Humidity Range ◽  
Humidity Range

A novel, highly sensitive gold nanowire (AuNW) resistive sensor is reported here for humidity sensing in the relative humidity range of 11% to 92% RH as well as for breath sensing.

scholarly journals The Effect of Au Nanoparticle Addition on Humidity Sensing with Ultra-Small TiO2 Nanoparticles

Chemosensors ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 170
Author(s):  
Tommaso Addabbo ◽  
Irene Cappelli ◽  
Ada Fort ◽  
Marco Mugnaini ◽  
Enza Panzardi ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Tio2 Nanoparticles ◽  
Transient Behavior ◽  
Point Of View ◽  
Au Nanoparticle ◽  
Theoretical Point ◽  
Impedance Spectra ◽  
Humidity Sensing ◽  
Relative Humidity Range ◽  
Humidity Range

In this paper, we investigate humidity sensing through impedance measurements with TiO2 nanoparticles (about 6 nm in diameter). The transient behavior and the impedance spectra are measured and interpreted from the theoretical point of view. Large responses are shown especially in the relative humidity range from 30% to 80%, which are essentially explained by condensation in the nanopores. The effect of the addition of Au nanoparticles is investigated and as expected, the Au/TiO2 interfaces allow for dramatically reducing the sensing film response time and above all, its recovery time; moreover, it seems to favor condensation when the relative humidity overcomes 70%.

The Synthesis of YBa3Cu4Ox Superconductor and Comparison with YBa2Cu3Ox

2014 ◽  
Vol 979 ◽  
pp. 220-223
Author(s):  
Piyamas Chainok ◽  
Supphadate Sujinnapram ◽  
Tunyanop Nilkamjon ◽  
Sermsuk Ratreng ◽  
Kiattipong Somsri ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Grain Size ◽  
Solid State ◽  
Solid State Reaction ◽  
Profile Analysis ◽  
Analysis Method ◽  
Orthorhombic Structure ◽  
Resistivity Measurements ◽  
Full Profile ◽  
Sem Micrograph

In this research, the Y123 (YBa2Cu3Ox) and Y134 (YBa3Cu4Ox) superconductors were synthesized by solid state reaction and melt process, respectively. The crystal structure of all the samples were then determined using the Rietveld full-profile analysis method to indicate orthorhombic structure. The resistivity measurements showing Tc onset of Y123 lower than Y134 for solid state reaction but higher than Y134 melt process. However, the critical temperature off-set of Y134 has lower than of Y123. The SEM and EDX show that all samples were inhomogeneous. The SEM micrograph for solid state reaction Y123 has many pores between the grain and the grain size clearly demonstrated and bigger than Y134. It was seen that these pores are party eliminated in melt process samples. FTIR spectra detected the trace of carbonate residue in all samples.

scholarly journals Boltzmann-Based Empirical Model to Calculate Volume Loss during Spirit Ageing

Beverages ◽  
2019 ◽  
Vol 5 (4) ◽  
pp. 60
Author(s):  
Noemí del Toro del Toro ◽  
Fredy Fong Casas ◽  
Julio Ayan Rial ◽  
Maria Caridad Portuondo González ◽  
Harold Crespo Sariol ◽  
...  
Keyword(s):  
Boltzmann Equation ◽  
Relative Humidity ◽  
Quercus Alba ◽  
Volume Loss ◽  
Air Humidity ◽  
White Oak ◽  
The Boltzmann Equation ◽  
Relative Humidity Range ◽  
Two Parameters ◽  
Humidity Range

The Boltzmann equation is applied to fit data of volume loss for evaporation (in %) during spirit ageing in northern white oak (Quercus Alba) standard barrels of 205 L (+/− 10 L) using a temperature and humidity controlled cellar. The Boltzmann equation satisfactory fitted to the experimental data of the volume loss against temperature at constant humidity. Two parameters of the Boltzmann equation showed a linear dependency on the relative humidity of the air, while the other two parameters exhibited a constant value independently of the air humidity. The found empirical mathematical model can be used to calculate the volume loss for evaporation of spirits (40% v/v of ethanol) during ageing in terms of relative humidity (range: 40%–95%) and temperature (range: 10–30 °C) with significant accuracy.

Bioinspired stimuli-responsive multilayer film made of silk–titanate nanocomposites

2017 ◽  
Vol 5 (16) ◽  
pp. 3924-3931 ◽  
Author(s):  
Elena Colusso ◽  
Giovanni Perotto ◽  
Yu Wang ◽  
Marco Sturaro ◽  
Fiorenzo Omenetto ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Multilayer Structure ◽  
Multilayer Film ◽  
Stimuli Responsive ◽  
Term Stability ◽  
Long Term Stability ◽  
Relative Humidity Range ◽  
Responsive Behavior ◽  
Humidity Range

A bioinspired multilayer film made of a new silk–titanate nanocomposite material, showing a humidity-responsive behavior, has been fabricated. The multilayer structure mimics the structure of the cuticle of the Hoplia coerulea beetle and shows long-term stability over a very large relative humidity range.

Entomological Problems of Food Storage in Northern Nigeria

1952 ◽  
Vol 43 (1) ◽  
pp. 111-144 ◽  
Author(s):  
R. W. Howe
Keyword(s):  
Relative Humidity ◽  
Moisture Content ◽  
Food Storage ◽  
Northern Nigeria ◽  
Diurnal Range ◽  
Relative Humidity Range ◽  
The Mean ◽  
Humidity Range

In Nigeria, shelled groundnuts are stored in sacks in covered warehouses and as pyramids in the open air. At the beginning of storage the nuts comprise approximately equal quantities of whole, split and broken nuts of a moisture content of 3·4 per cent. The sacks are exposed to direct hot sun whilst stacking.The mean monthly maximum shade temperature in Kano ranges from 101°F. in April to 85°F. in January and August and the mean monthly minimum from 75°F. in May to 56°F. in January. Monthly maximum relative humidities range from 100 per cent, in August and September to 45 per cent, in February, and the monthly minimum from 71 per cent, in August to 12 per cent, in February. The range of mean relative humidity is 81 per cent, in August and 18 per cent, in February. Rains fall between April and September, 70 per cent, falling in July and August. Heavy falls are recorded on about 25 days.Inside warehouses, the maximum monthly temperatures are 102°F. in May and 79°F. in January and February, and minimum temperatures are 81°F. in June, and 58°F. in February. In August the mean relative humidity range is 93 per cent, to 70 per cent. In December it is 34 per cent. to 20 per cent.Just under the roof of a warehouse and on the surface of pyramids the diurnal range is very large.

High relative humidity range sensor based on polymer-coated STW resonant device

2004 ◽  
Vol 100 (1-2) ◽  
pp. 126-130 ◽  
Author(s):  
P. Bruno ◽  
G. Cicala ◽  
F. Corsi ◽  
A. Dragone ◽  
A.M. Losacco
Keyword(s):  
Relative Humidity ◽  
High Relative Humidity ◽  
Range Sensor ◽  
Relative Humidity Range ◽  
Humidity Range

scholarly journals Effect of Relative Humidity on Mycelial Growth of Cercospora canescens

2021 ◽  
Vol 9 (3) ◽  
pp. 276-278
Author(s):  
Naresh Kumar ◽  
Keyword(s):  
Relative Humidity ◽  
Mycelial Growth ◽  
Mycelium Growth ◽  
Humidity Level ◽  
Mycelia Growth ◽  
Cent Relative Humidity ◽  
Relative Humidity Range ◽  
Humidity Range

The relative humidity studies revealed that maximum mycelial of fungus was observed at 90 per cent relative humidity (89.00 mm), which was followed by 100 per cent (86.30 mm). The least mycelia growth was observed at 50 per cent (45.30 mm). A significant decrease in mycelium growth was observed at 80, 70 and 60 per cent (80.40 mm, 70.20 mm and 57.00 mm) humidity level, respectively. Each fungus has its relative humidity range for the growth.

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