scholarly journals CNT-Based Inkjet-Printed RF Gas Sensor: Modification of Substrate Properties during the Fabrication Process

Sensors ◽  
2019 ◽  
Vol 19 (8) ◽  
pp. 1768 ◽  
Author(s):  
Julien George ◽  
Aymen Abdelghani ◽  
Prince Bahoumina ◽  
Olivier Tantot ◽  
Dominique Baillargeat ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Electrical Characterization ◽  
Sensitive Material ◽  
Paper Substrate ◽  
Microstrip Technology ◽  
Multi Wall Carbon Nanotubes ◽  
Silver Ink ◽  
Substrate Properties ◽  
Printed Materials ◽  
The Impact

This paper presents the feasibility of a fully inkjet-printed, microwave flexible gas sensor based on a resonant electromagnetic transducer in microstrip technology and the impact of the printing process that affects the characteristics of the gas sensor. The sensor is fabricated using silver ink and multi-wall carbon nanotubes (MWCNTs) embedded in poly (3,4-ethylenedioxythiophene) polystyrene (PEDOT: PSS-MWCNTs) as sensitive material for Volatile Organic Compounds (VOCs) detection. Particular attention is paid to the characterization of the printed materials and the paper substrate. The manufacturing process results in a change in relative permittivity of the paper substrate by nearly 20%. Electrical characterization, made in the presence of gas, validates our theoretical approach and the radiofrequency (RF) gas sensor proof of concept.

Room Temperature NO2 Gas Sensor Based on Functionalized Carbon Nanotubes /Nickel Oxide Nanoparticles

2020 ◽  
Vol 30 ◽  
pp. 1-7
Author(s):  
Sally K. Abbas ◽  
Asama N. Naje
Keyword(s):  
Carbon Nanotubes ◽  
Response Time ◽  
Nickel Oxide ◽  
Gas Sensor ◽  
High Sensitivity ◽  
Single Wall Carbon Nanotubes ◽  
Oxide Nanoparticles ◽  
Sensitive Material ◽  
Nickel Oxide Nanoparticles ◽  
Multi Wall Carbon Nanotubes

Functionalized-multi wall carbon nanotubes (F-MWCNTs) and functionalized-single wall carbon nanotubes (F-SWCNTs) were well enhanced using NiO Nanoparticles. The sensor device consisted of a film of sensitive material (F-MWCNTs/ Nickel oxide nanoparticles) and (F-SWCNTs/ Nickel oxide nanoparticles) deposited by drop casting on n-type porous silicon substrate. The two sensors perform high sensitivity to NO2 gas at particular temperatures. The analysis indicated that the (F-MWCNTs/NiONPs) have a better performance than (F-SWCNTs/NiONPs). The F-SWCNTs/NiONPs gas sensor shows high sensitivity (18.2 %) at RT with response time 16 sec, while F-MWCNTs/NiONPs gas sensor show better sensitivity (45 %) at RT with response time 26 sec. The device shows a very reproducible sensor performance, with high repeatability, complete recovery and adequate response. A demonstration of the improvement in sensing of NO2 gas using NiO-functionalized nanotubes is provided.

scholarly journals Enhancement of functionalized carbon nanotubes gas sensor by adding metal oxide nanoparticles

2020 ◽  
Vol 18 (47) ◽  
pp. 62-72
Author(s):  
Sally K. Abbas ◽  
Asama Natik Naje
Keyword(s):  
Carbon Nanotubes ◽  
Response Time ◽  
Gas Sensor ◽  
Metal Oxide Nanoparticles ◽  
High Sensitivity ◽  
Complete Recovery ◽  
Single Wall Carbon Nanotubes ◽  
Sensitive Material ◽  
Multi Wall Carbon Nanotubes ◽  
Sensor Performance

Functionalized-multi wall carbon nanotubes (F-MWCNTs) and functionalized-single wall carbon nanotubes (F-SWCNTs) were well enhanced using CoO Nanoparticles. The sensor device consisted of a film of sensitive material (F-MWCNTs/CoONPs) and (F-SWCNTs/CoO NPs) deposited by drop- casting on an n-type porous silicon substrate. The two sensors perform high sensitivity to NO2 gas at room temperatures. The analysis indicated that the (F-MWCNTs/CoONPs) have a better performance than (F-SWCNTs/CoONPs). The F-SWCNTs/CoONPs gas sensor shows high sensitivity (19.1 %) at RT with response time 17 sec, while F-MWCNTs/CoONPs gas sensor show better sensitivity (39 %) at RT with response time 13 sec. The device shows a very reproducible sensor performance, with high repeatability, complete recovery, and adequate response. A demonstration of the improvement in sensing of NO2 gas using CoO-functionalized nanotubes is provided.

scholarly journals Advanced Greenhouse Horticulture: New Technologies and Cultivation Practices

Horticulturae ◽  
2020 ◽  
Vol 7 (1) ◽  
pp. 1
Author(s):  
Athanasios Koukounaras
Keyword(s):  
New Technologies ◽  
Light Emitting Diode ◽  
Dye Sensitized Solar Cells ◽  
Original Research ◽  
Brewery Wastewater ◽  
Cultivation Practices ◽  
Substrate Properties ◽  
Greenhouse Horticulture ◽  
Negative Impacts ◽  
The Impact

Greenhouse horticulture is one of the most intensive agricultural systems, with the advantages of environmental parameter control (temperature, light, etc.), higher efficiency of resource utilization (water, fertilizers, etc.) and the use of advanced technologies (hydroponics, automation, etc.) for higher productivity, earliness, stability of production and better quality. On the other hand, climate change and the application of high inputs without suitable management could have negative impacts on the expansion of the greenhouse horticulture sector. This special issue gathers twelve papers: three reviews and nine of original research. There is one review that focuses on irrigation of greenhouse crops, while a second surveys the effects of biochar on container substrate properties and plant growth. A third review examines the impact of light quality on plant–microbe interactions, especially non-phototrophic organisms. The research papers report both the use of new technologies as well as advanced cultivation practices. In particular, new technologies are presented such as dye-sensitized solar cells for the glass cover of a greenhouse, automation for water and nitrogen deficit stress detection in soilless tomato crops based on spectral indices, light-emitting diode (LED) lighting and gibberellic acid supplementation on potted ornamentals, the integration of brewery wastewater treatment through anaerobic digestion with substrate-based soilless agriculture, and application of diatomaceous earth as a silica supplement on potted ornamentals. Research studies about cultivation practices are presented comparing different systems (organic-conventional, aeroponic-nutrient film technique (NFT)-substrate culture), quantitative criteria for determining the quality of grafted seedlings, and of wild species as alternative crops for cultivation.

Analysis of single and multi-wall carbon nanotubes (SWCNT/MWCNT) in the flow of Maxwell nanofluid with the impact of magnetic dipole

2021 ◽  
Vol 1200 ◽  
pp. 113223
Author(s):  
Varun Kumar ◽  
J.K. Madhukesh ◽  
A.M. Jyothi ◽  
B.C. Prasannakumara ◽  
M. Ijaz Khan ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Magnetic Dipole ◽  
Multi Wall Carbon Nanotubes ◽  
Maxwell Nanofluid ◽  
The Impact

Gas sensitive material on the basis of cholesteric-nematic mixture doped carbon nanotubes for optoelectronic NH3 gas sensor

2017 ◽  
Author(s):  
Vasyl S. Petryshak ◽  
Maria V. Vistak ◽  
Orest Y. Sushynkyi ◽  
Zinoviy M. Mikityuk ◽  
Hryhoriy I. Barylo ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Gas Sensor ◽  
Sensitive Material

scholarly journals Fabrication of Porous Silicon Based Humidity Sensing Elements on Paper

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Tero Jalkanen ◽  
Anni Määttänen ◽  
Ermei Mäkilä ◽  
Jaani Tuura ◽  
Martti Kaasalainen ◽  
...  
Keyword(s):  
Porous Silicon ◽  
Smart Cities ◽  
Low Cost ◽  
Electrical Characterization ◽  
Fabrication Process ◽  
Sensing Element ◽  
Paper Substrate ◽  
Roll To Roll ◽  
Silver Electrodes ◽  
Silicon Based

A roll-to-roll compatible fabrication process of porous silicon (pSi) based sensing elements for a real-time humidity monitoring is described. The sensing elements, consisting of printed interdigitated silver electrodes and a spray-coated pSi layer, were fabricated on a coated paper substrate by a two-step process. Capacitive and resistive responses of the sensing elements were examined under different concentrations of humidity. More than a three orders of magnitude reproducible decrease in resistance was measured when the relative humidity (RH) was increased from 0% to 90%. A relatively fast recovery without the need of any refreshing methods was observed with a change in RH. Humidity background signal and hysteresis arising from the paper substrate were dependent on the thickness of sensing pSi layer. Hysteresis in most optimal sensing element setup (a thick pSi layer) was still noticeable but not detrimental for the sensing. In addition to electrical characterization of sensing elements, thermal degradation and moisture adsorption properties of the paper substrate were examined in connection to the fabrication process of the silver electrodes and the moisture sensitivity of the paper. The results pave the way towards the development of low-cost humidity sensors which could be utilized, for example, in smart packaging applications or in smart cities to monitor the environment.

The impact of substrate properties and thermal annealing on tantalum nitride thin films

2012 ◽  
Vol 258 (7) ◽  
pp. 2894-2900 ◽  
Author(s):  
M. Grosser ◽  
M. Münch ◽  
H. Seidel ◽  
C. Bienert ◽  
A. Roosen ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermal Annealing ◽  
Tantalum Nitride ◽  
Substrate Properties ◽  
The Impact

scholarly journals An analysis of the circumstances and factors that have influenced the development of Animation Industry in Iran in the 1960-2002 periods

2015 ◽  
Vol 16 (SE) ◽  
pp. 61-77
Author(s):  
Naser Golmohammadi
Keyword(s):  
Cultural Policy ◽  
Animation Industry ◽  
Historical View ◽  
Feature Films ◽  
Art Form ◽  
Iranian History ◽  
The Government ◽  
Printed Materials ◽  
The One ◽  
The Impact

In the early part of 20th century animation emerged as a revolutionary way of making art. It evolved into a powerful means of expression and creativity of artists who could merge all art genres into one art form. The subsequent developments of animation have opened its diverse uses in entertainment business, education and political propaganda. This article attempts to examine the factors that have influenced and shaped the development of animation industry in Iran. It takes a historical view and investigates the impacts of changing socio-economic and political forces that have determined the functions of animation in the Iranian society. The study traces the establishment of the industry to the government-run centres, describing the pioneering role of artists who gave rise to the ‘golden age’ of animation in the pre-revolutionary Iran. Especial attention is throughout paid to the long and rich cultural and artistic heritages, as the thematic basis for indigenously produced animated films in Iran. The growth of the industry is considered in conjuncture with the expansion of feature films cinema and expansion of television networks. The latter is particularly important for the fact that it provides a secured market for a sizeable audience of children and young people in Iran. The study analyses the impact of the 1979 Islamic Revolution on the animation industry from a period of stagnation to a highly promoted and government sponsored artistic and industrial activity. In the post-revolutionary period, the industry was transformed from one reflecting the Iranian history and culture to the one that emphasises the Islamic-Iranian values and Islamic traditions; hence animation has become an ideological means in propagating the cultural policy of the state. Thus, animation has increasingly become a cultural industry assigned to supply growing needs of television and artistic works reserved for international festivals.This research is largely based on extensive interviews with animation artists and those who are working in the industry complemented with a sample of questionnaires addressed to both Iranian artists and foreign observers and participants in the Iranian International festivals on animation. The research methodology is also supplemented with the research on printed materials – very few and often descriptive- and personal experience of working over twenty years in the industry.

Electrical Characterization of E7 Liquid Crystal Molecules under the Impact of an External Electric Field (THz): A Theoretical approach

2020 ◽  
Vol 15 (2) ◽  
pp. 95-101
Keyword(s):  
Liquid Crystal ◽  
Electric Field ◽  
Order Parameter ◽  
Optical Switching ◽  
Rapid Change ◽  
Electrical Characterization ◽  
Optical Switching Devices ◽  
The Impact ◽  
Orientation Of Molecules

In this work, different parameters of E7 liquid crystal (LC) have been calculated under the influence of an electric field in THz frequency. The E7 LC parameters have positive as well as negative values of order parameter and birefringence under the influence for an electric field. The director angle of E7 LC shows fast fluctuations above the angle θ=45° and due to rapid change in the orientation of molecules, fast electro-optical switching devices based on E7 LC can be designed. The refractive index of the E7 LC maintains stability in THz frequency.

Sign in / Sign up

Export Citation Format

Share Document