Controlled Growth and Characterization Ag/ZnO Nanotetrapods for Humidity Sensing

2018 ◽  
Vol 21 (7) ◽  
pp. 462-467
Author(s):  
Babak Sadeghi
Keyword(s):  
Room Temperature ◽  
Zinc Complex ◽  
Water Solution ◽  
Particle Morphology ◽  
Quick Response ◽  
Separation System ◽  
Humidity Sensing ◽  
Sensor Material ◽  
Highly Sensitive

Aim and Objective: Ultrafine Ag/ZnO nanotetrapods (AZNTP) have been prepared successfully using silver (I)–bis (oxalato) zinc complex and 1, 3-diaminopropane (DAP) with a phase separation system, and have been injected into a diethyl/water solution. Materials and Methods: This crystal structure and lattice constant of the AZNTP obtained were investigated by means of a SEM, XRD, TEM and UV-vis spectrum. Results: The results of the present study demonstrated the growth and characterization AZNTP for humidity sensing and DAP plays a key role in the determination of particle morphology. AZNTP films with 23 nm in arm diameter have shown highly sensitive, quick response sensor material that works at room temperature.

scholarly journals Synthesis and Characterization of Ultrafine Ag/ZnO Nanotetrapods (AZNTP) for Environment Humidity Sensing

2018 ◽  
Vol 5 (2) ◽  
pp. 115-119
Author(s):  
Babak Sadeghi
Keyword(s):  
High Surface ◽  
High Sensitivity ◽  
Particle Morphology ◽  
Separation System ◽  
Humidity Sensing ◽  
Physisorbed Water ◽  
Heat Regeneration ◽  
High Surface Activity

Ag/ZnO nanotetrapods (AZNTP) are prepared using silver (I)–bis (oxalato) zinc complex and 1, 3-diaminopropane (DAP) under a phase separation system. This crystal structure and lattice constant of the AZNTP was investigated by means of XRD, TEM, and UV-vis spectrum. AZNTP films with 23 nm in arm diameter and high surface activity work at room temperature as humidity sensors. AZNTP have shown some properties including quick response with high sensitivity, a longer life span and recovery, and no need for heat regeneration. Moreover, AZNTP could form OH group with physisorbed water in wet environments. The results of the present study demonstrated that the growth and characterization of AZNTP for environmental humidity sensing and DAP play an original role in the determination of particle morphology. Ultra-thin AZNTP has also been tested as a resistance sensor, having an unusual high sensitivity to moisture.

scholarly journals Spectrophotometric determination of sotalol in tablets

2018 ◽  
pp. 49-55
Author(s):  
Y. M. Zhuk ◽  
S. O. Vasyuk
Keyword(s):  
Quantitative Determination ◽  
Room Temperature ◽  
Cost Effective ◽  
Pharmaceutical Formulations ◽  
Molar Absorptivity ◽  
Pharmaceutical Drugs ◽  
Analysis Method ◽  
Highly Sensitive ◽  
Colored Product

In this investigation a visible spectrophotometric method for the determination of sotalol based on the absorbance of colored product of the reaction between sotalol hydrochloride and bromcresol purple in acetone medium at 399 nm measurement was developed. The optimal conditions for the quantitative determination of sotalol hydrochloride in the content of pharmaceutical drugs were established. The stoichiometric relationship coefficients between sotalol hydrochloride and bromcresol purple were determined. The validation of the worked out procedure on such validated characteristics as linearity, precision, accuracy and robustness was carried out. The aim. To develop a highly sensitive, easy to use, cost-effective and valid method for quantitative determination of sotalol hydrochloride in dosage forms. The analysis method. Visible spectrophotometry. The analytical parameters such as molar absorptivity, Beer’s law limits and Sandell’s sensitivity values were calculated. The developed methods give the result with repeatability sufficient for dependable determination the investigated substance in pharmaceutical formulations. Accuracy established by analyte addition technique. Determined factors that influence on the absorbance value: reagent quantity and timing stability. Sample solutions stable during 30 min. Addition to sample solution ± 10% bromcresol purple solution is not change the absorbance value. Established that reaction between sotalol hydrochloride and bromcresol purple proceeds in acetone medium at room temperature. Molar absorption coefficient is 2,62∙103.

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.

WO3-x Nanorod Arrays Based Sensors with High Sensitivity and Quick Response for Detecting Pollutants

2008 ◽  
Vol 1080 ◽  
Author(s):  
Xinpeng Wang ◽  
Jie Lou ◽  
Zhenbo Wang ◽  
Peter Xianping Feng
Keyword(s):  
Experimental Data ◽  
Recovery Time ◽  
Room Temperature ◽  
Operating Temperature ◽  
High Sensitivity ◽  
Two Dimensional ◽  
Quick Response ◽  
Nanorod Arrays ◽  
Highly Sensitive ◽  
Different Temperatures

ABSTRACTTungsten oxide nanorod arrays deposited on the cylindrical substrate have been used for fabrication of a two-dimensional (2D) sensor. The sensibility and capacity towards methane and acetone at different temperatures have been examined. Experimental data have indicated that the newly designed sensor is highly sensitive to methane with low cross sensitivity towards possible mixed organic gas acetone, relying on the operating temperature. At room temperature (20°C), a quick response time and recovery time of the sensor, less than 10 ms, have been obtained.

Enzyme-free selective determination of H2O2 and glucose using functionalized CuNP-modified graphite electrode in room temperature ionic liquid medium

RSC Advances ◽  
2014 ◽  
Vol 4 (88) ◽  
pp. 47497-47504 ◽  
Author(s):  
Rajendran Suresh Babu ◽  
Pandurangan Prabhu ◽  
Sangilimuthu Sriman Narayanan
Keyword(s):  
Ionic Liquid ◽  
Liquid Medium ◽  
Modified Electrode ◽  
Room Temperature ◽  
Graphite Electrode ◽  
Room Temperature Ionic Liquid ◽  
Selective Determination ◽  
Highly Sensitive ◽  
Ionic Liquid Medium

The proposed method demonstrates a new PCFCuNP modified electrode using ionic liquid as a green electrolyte. This method also achieved highly sensitive and selective determination towards H2O2 and glucose.

Cryomicroscopy of low-Tg latex particles via freeze drying

1993 ◽  
Vol 51 ◽  
pp. 1198-1199
Author(s):  
J. R. Reffner
Keyword(s):  
Electron Microscopy ◽  
Freeze Drying ◽  
Room Temperature ◽  
Film Formation ◽  
Direct Determination ◽  
Particle Morphology ◽  
Latex Particles ◽  
Transmission Electron

Transmission Electron Microscopy (TEM) is a powerful tool for investigating the structure of latex particles. However, examining low Tg (glass transision, Tg < room temperature) latex particles requires special techniques due to the significant deformation which occurs if the particles are dispersed onto a substrate at room temperature. Here a freeze drying (FD) technique is presented which permits individual emulsion particles, including stained particles, to be examined in a manner that minimizes deformation by maintaining the particles at temperatures below Tg.Typically, particle morphology is determined from images of individual latex particles dispersed onto a supporting ultra-thin substrate or from images of ultra-microtomed sections of films cast from the latex. Examining particles dispersed onto a substrate is often advantageous, allowing direct determination of particle shape and characterization of the morphology prior to the film formation process. Although low Tg materials can be examined using this technique, information about the size, shape and morphology of phase separated domains can be obscured by the deformation which occurs when the particles are examined at room temperature.

scholarly journals Cu-based metal–organic framework HKUST-1 as effective catalyst for highly sensitive determination of ascorbic acid

RSC Advances ◽  
2020 ◽  
Vol 10 (39) ◽  
pp. 22881-22890 ◽  
Author(s):  
Tianyang Shen ◽  
Tianchen Liu ◽  
Hanqi Mo ◽  
Zichen Yuan ◽  
Feng Cui ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Room Temperature ◽  
Metal Organic Framework ◽  
Solvent Method ◽  
Effective Catalyst ◽  
Highly Sensitive ◽  
Metal Organic ◽  
Sensitive Determination ◽  
Organic Framework

In this work, a Cu-based nanosheet metal–organic framework (MOF), HKUST-1, was synthesised using a solvent method at room temperature and it demonstrated high capability and sensitivity towards the oxidation of ascorbic acid (AA).

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