Humidity and Ammonia Vapor Sensing Applications of Polyaniline–Polyacrylonitrile Composite Films

2010 ◽  
Vol 2 (4) ◽  
pp. 474-480 ◽  
Author(s):  
Asif Ali Khan ◽  
Mohd. Khalid ◽  
Ram Niwas
Keyword(s):  
Composite Films ◽  
Ammonia Vapor ◽  
Vapor Sensing ◽  
Sensing Applications

Self-Assembled Gold Nanoparticle/Dendrimer Composite Films for Vapor Sensing Applications

Nano Letters ◽  
2002 ◽  
Vol 2 (5) ◽  
pp. 551-555 ◽  
Author(s):  
Nadejda Krasteva ◽  
Isabelle Besnard ◽  
Berit Guse ◽  
Roland E. Bauer ◽  
Klaus Müllen ◽  
...  
Keyword(s):  
Gold Nanoparticle ◽  
Composite Films ◽  
Vapor Sensing ◽  
Sensing Applications ◽  
Self Assembled

SILAR-coated Mg-doped ZnO thin films for ammonia vapor sensing applications

2020 ◽  
Vol 31 (13) ◽  
pp. 10186-10195 ◽  
Author(s):  
K. Radhi Devi ◽  
G. Selvan ◽  
M. Karunakaran ◽  
K. Kasirajan ◽  
L. Bruno Chandrasekar ◽  
...  
Keyword(s):  
Thin Films ◽  
Zno Thin Films ◽  
Ammonia Vapor ◽  
Vapor Sensing ◽  
Sensing Applications ◽  
Doped Zno ◽  
Mg Doped

scholarly journals A Review: Carbon Nanotube-Based Piezoresistive Strain Sensors

2012 ◽  
Vol 2012 ◽  
pp. 1-15 ◽  
Author(s):  
Waris Obitayo ◽  
Tao Liu
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Composite Films ◽  
Strain Sensors ◽  
Voltage Response ◽  
Strain Sensing ◽  
Multiwalled Carbon ◽  
Sensing Applications ◽  
Mechanical Deformations ◽  
Electrical Resistivities

The use of carbon nanotubes for piezoresistive strain sensors has acquired significant attention due to its unique electromechanical properties. In this comprehensive review paper, we discussed some important aspects of carbon nanotubes for strain sensing at both the nanoscale and macroscale. Carbon nanotubes undergo changes in their band structures when subjected to mechanical deformations. This phenomenon makes them applicable for strain sensing applications. This paper signifies the type of carbon nanotubes best suitable for piezoresistive strain sensors. The electrical resistivities of carbon nanotube thin film increase linearly with strain, making it an ideal material for a piezoresistive strain sensor. Carbon nanotube composite films, which are usually fabricated by mixing small amounts of single-walled or multiwalled carbon nanotubes with selected polymers, have shown promising characteristics of piezoresistive strain sensors. Studies also show that carbon nanotubes display a stable and predictable voltage response as a function of temperature.

Active Starch/PVA Composite Films Containing Syzygium oleana for Ammonia Vapor Colorimetric Indicators

2020 ◽  
Vol 990 ◽  
pp. 318-324
Author(s):  
Arie Listyarini ◽  
Windri Handayani ◽  
Vivi Fauzia ◽  
Cuk Imawan
Keyword(s):  
Tensile Strength ◽  
Water Vapor ◽  
Color Change ◽  
Transmission Rate ◽  
Composite Films ◽  
Ammonia Vapor ◽  
Water Vapor Transmission Rate ◽  
Food Spoilage ◽  
Water Vapor Transmission ◽  
Food Freshness

Ammonia is one of the compounds released during the food spoilage process, so a device that can detect ammonia can be used as an indicator of food spoilage. This article reports on the preparation and characteristics of Starch/PVA composite films with Syzygium oleana as indicator films to detect ammonia vapor. The indicator was made by first preparing the starch / PVA composite films by casting method and then the films were dipped in Syzygium oleana extract. These films were characterized by using a UV-Vis spectrophotometer, Fourier Transformed Infra-Red Spectrophotometer and tested for mechanical properties such as tensile strength and elongation, and the water vapor transmission rate (WVT). The results showed that the addition of PVA reduced the absorbance value in the UV and visible area, the value of the water vapor transmission rate and the tensile strength but the elongation value of the film on the other hand rose. The indicator films can detect ammonia which was marked by its color change from red to blue. For further application, it can be used as a smart packaging label that can detect food freshness.

scholarly journals Enhanced Piezoelectric Properties of Poly(Vinylidenefluoride-Co-Trifluoroethylene)/Carbon-Based Nanomaterial Composite Films for Pressure Sensing Applications

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2999
Author(s):  
Jia-Wun Li ◽  
Chen-Yang Huang ◽  
Kuan-Yu Chen ◽  
Jian-Xun Chen ◽  
Xiao-Yong Hsu ◽  
...  
Keyword(s):  
Piezoelectric Effect ◽  
Composite Films ◽  
Cooh Group ◽  
Sensing Element ◽  
Β Phase ◽  
Sensing Applications ◽  
Maleic Anhydride Copolymer ◽  
Carbon Based Nanomaterials ◽  
Modified Carbon Nanotubes ◽  
Carbon Based

In this study, heat and polarization treatments were applied to poly(vinylidenefluoride-co-trifluoroethylene (PVDF-TrFE) films to improve their crystallinity and piezoelectric effect. Carbon-based nanomaterials (CBNs) of multiple dimensions (i.e., modified zero-dimensional (0D) carbon black (OCB), one-dimensional (1D) modified carbon nanotubes (CNT–COOH) and two-dimensional (2D) graphene oxide (GO)) were added to the copolymer to study the effects of different CBN dimensions on the crystallinity and piezoelectric effect of PVDF-TrFE films. Additionally, amphiphilic polymeric dispersants were added to improve the dispersibility of CBNs; the dispersant was synthesized by the amidation, and imidization reactions of styrene-maleic anhydride copolymer (SMAz) and polyoxyalkylene amine (M1000). Polymer solutions with different ratios of CBN to dispersant (z = 10:1, 5:1, 1:1, 1:5, 1:10) were prepared. The enhanced dispersibility enabled the fluorine atoms in the PVDF-TrFE molecular chain to more efficiently form hydrogen bonds with the –COOH group in the CBN, thereby increasing the content of the β crystal phase (the origin of the piezoelectric effect) of the film. Therefore, the resulting film exhibited a higher output voltage on the application side and better sensitivity on the sensing element. The addition of CNT–COOH and polymeric dispersants increased the β-phase content in PVDF-TrFE from 73.6% to 86.4%, which in turn raised the piezoelectric coefficient from 19.8 ± 1.0 to 26.4 ± 1.3 pC/N. The composite film-based pressure sensor also exhibited a high degree of sensitivity, which is expected to have commercial potential in the future.

Single-walled carbon nanotube networks for ethanol vapor sensing applications

Nano Research ◽  
2012 ◽  
Vol 6 (2) ◽  
pp. 77-86 ◽  
Author(s):  
Ilya V. Anoshkin ◽  
Albert G. Nasibulin ◽  
Prasantha R. Mudimela ◽  
Maoshuai He ◽  
Vladimir Ermolov ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Ethanol Vapor ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Vapor Sensing ◽  
Sensing Applications ◽  
Carbon Nanotube Networks

Band alignment and depletion zone at ZnO/CdS and ZnO/CdSe hetero-structures for temperature independent ammonia vapor sensing

2016 ◽  
Vol 18 (47) ◽  
pp. 32057-32071 ◽  
Author(s):  
N. Rajeswari Yogamalar ◽  
K. Sadhanandham ◽  
A. Chandra Bose ◽  
R. Jayavel
Keyword(s):  
Band Alignment ◽  
Cds Nanoparticles ◽  
Ammonia Vapor ◽  
Depletion Zone ◽  
Vapor Sensing

The excitation of CdS nanoparticles and the narrowing of depletion zone formed between the ZnO and CdS hetero-structures determine the sensing of ammonia vapor.

Improved ammonia vapor sensing properties of Al-doped ZnO nanoparticles prepared by sol-gel process

2021 ◽  
Author(s):  
I Loyola Poul Raj ◽  
S Gobalakrishnan ◽  
P.K Praseetha ◽  
Natarajan Chidhambaram ◽  
S S. Saravanakumar ◽  
...  
Keyword(s):  
Zno Nanoparticles ◽  
Sol Gel ◽  
Ammonia Vapor ◽  
Sensing Properties ◽  
Vapor Sensing ◽  
Sol Gel Process ◽  
Doped Zno
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