Highly sensitive ethylene glycol-doped PEDOT–PSS organic thin films for LPG sensing

In this study, for the first time we report the fabrication of low-cost ethylene glycol (EG)-doped PEDOT–PSS (poly 3,4-ethylenedioxythiophene:polystyrene sulfonate) organic thin film sensors for the detection of LPG at room temperature.

Download Full-text

Highly sensitive and selective polyaniline thin-film sensors for detecting SF6 decomposition products at room temperature

Synthetic Metals ◽

10.1016/j.synthmet.2014.12.033 ◽

2015 ◽

Vol 200 ◽

pp. 74-79 ◽

Cited By ~ 16

Author(s):

Xiaoxing Zhang ◽

Xiaoqing Wu ◽

Lei Yu ◽

Bing Yang ◽

Junjie Zhou

Keyword(s):

Thin Film ◽

Room Temperature ◽

Decomposition Products ◽

Thin Film Sensors ◽

Highly Sensitive ◽

Sf6 Decomposition

Download Full-text

Formaldehyde Detection Based on P3HT/InSnO Composite Thin Film Transistor

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.875-877.82 ◽

2014 ◽

Vol 875-877 ◽

pp. 82-86

Author(s):

Xian Li ◽

Ya Dong Jiang ◽

Hui Ling Tai ◽

Guang Zhong Xie ◽

Wen Chao Dan

Keyword(s):

Thin Film ◽

Composite Film ◽

Thin Film Transistors ◽

Room Temperature ◽

Thin Film Transistor ◽

Organic Thin Film Transistors ◽

Composite Thin Film ◽

Organic Thin Film ◽

Response And Recovery

Formaldehyde, a colorless and pungent-smelling gas, had been confirmed be a huge threat to people health. The detection of formaldehyde was necessary and important at room temperature. Sprayed P3HT/InSnO composite film based on organic thin film transistors (OTFT) was fabricated to detect formaldehyde at room temperature in this paper. The results showed that P3HT/ InSnO-OTFT showed better response and recovery to HCHO compared with P3HT-OTFT at room temperature.

Download Full-text

Hydrogenated Graphene Based Organic Thin Film Transistor Sensor for Detection of Chloride Ions as Corrosion Precursors

Applied Sciences ◽

10.3390/app12020863 ◽

2022 ◽

Vol 12 (2) ◽

pp. 863

Author(s):

Mounia Chakik ◽

Siziwe Bebe ◽

Ravi Prakash

Keyword(s):

Thin Film ◽

Graphene Oxide ◽

Environmental Factors ◽

Low Cost ◽

Chloride Ions ◽

Functionalized Graphene ◽

Organic Thin Film ◽

Surface Wetness ◽

Hydrogenated Graphene ◽

Monitoring Protocols

Corrosion monitoring and management has been at the center of structural health monitoring protocols due to its damaging effects on metallic structures. Current corrosion prevention and management programs often fail to include environmental factors such as Cl− ions and surface wetness. Early detection of these environmental factors can prevent the onset of corrosion and reduce repair and maintenance-related expenses. There is growing interest in creating solution-processed thin film environmental sensors with high sensitivity to corrosion precursors, low-cost fabrication, and small footprint, rendering them viable candidates for investigation as potential corrosion sensors that could be easily integrated into existing structures and screen printed or patterned directly into surface coatings. In this work, we have implemented C60-based n-type organic thin film transistors (OTFTs) with functionalized graphene oxide for humidity sensing and functionalized graphene nanoparticles for Cl− ion detection, using low-cost solution processing techniques. The reduced graphene oxide (rGO)-coated OTFT humidity sensor is designed for the qualitative estimation of surface moisture levels and high levels of humidity, and it exhibits a relative responsivity for dry to surface wetness transition of 122.6% to surface wetness, within a response time of 20 ms. We furthermore implemented an in-house synthesized hydrogenated graphene coating in conjunction with a second OTFT architecture for Cl− ions sensing which yielded a sensitivity of 4%/ppm to ultrafine ionic concentrations, over an order of magnitude lower than the range identified to cause corrosion in aircraft structures.

Download Full-text

Highly sensitive thin film NH3 gas sensor operating at room temperature based on SnO2/MWCNTs composite

Sensors and Actuators B Chemical ◽

10.1016/j.snb.2007.09.088 ◽

2008 ◽

Vol 129 (2) ◽

pp. 888-895 ◽

Cited By ~ 146

Author(s):

Nguyen Van Hieu ◽

Luong Thi Bich Thuy ◽

Nguyen Duc Chien

Keyword(s):

Thin Film ◽

Gas Sensor ◽

Room Temperature ◽

Highly Sensitive

Download Full-text

Bias Stress in Organic Thin-Film Transistors Towards Low-Cost Flexible Gas Sensors

Journal of Integrated Circuits and Systems ◽

10.29292/jics.v16i2.197 ◽

2021 ◽

Vol 16 (2) ◽

pp. 1-11

Author(s):

José Enrique Eirez Izquierdo ◽

José Diogo da Silva Oliveira ◽

Vinicius Augusto Machado Nogueira ◽

Dennis Cabrera García ◽

Marco Roberto Cavallari ◽

...

Keyword(s):

Thin Film ◽

Flexible Electronics ◽

Thin Film Transistors ◽

Low Cost ◽

Thin Film Deposition ◽

Dielectric Surface ◽

Organic Thin Film Transistors ◽

Film Deposition ◽

Organic Thin Film ◽

Bias Stress

This work is focused on the bias stress (BS) effects in Organic Thin-Film Transistors (OTFTs) from poly(2,5-bis(3-alkylthiophen-2-yl)thieno[3,2-b]thiophene) (PBTTT-C14) on both highly-doped Si and glass substrates. While the former had a thermally-grown SiO2 dielectric, the latter demanded an alternative dielectric that should be capable to withstand bottom contact lithography, as well as semiconducting thin-film deposition. In addition, it should represent one more step towards flexible electronics. In order to do that, poly(4-vinylphenol) (PVP) was blended to poly(melamine-co-formaldehyde) methylated (PMF). OTFTs on glass with a cross-linked polymer dielectric had a charge carrier mobility (μ) of 4.0x10-4 cm2/Vs, threshold voltage (VT) of 18 V, current modulation (ION/OFF) higher than 1x102, and subthreshold slope (SS) of -7.7 V/dec. A negative BS shifted VT towards negative values and produced an increase in ION/OFF. A positive BS, on the other hand, produced the opposite effect only for OTFTs on Si. This is believed to be due to a higher trapping at the PVP:PMF interface with PBTTT-C14. Modeling the device current along time by a stretched exponential provided shorter time constants of ca. 105 s and higher exponents of 0.7–0.9 for devices on glass. Due to the presence of increased BS effects, the application of organic TFTs based on PVP:PMF as flexible sensors will require compensating circuits, lower voltages or less measurements in time. Alternatively, BS effects could be reduced by a dielectric surface treatment.

Download Full-text

New tailored organic semiconductors thin films for optoelectronic applications

The European Physical Journal Applied Physics ◽

10.1051/epjap/2021210090 ◽

2021 ◽

Author(s):

Dinesh Pathak ◽

Sanjay Kumar ◽

Sonali Andotra ◽

Jibin Thomas ◽

Navneet Kaur ◽

...

Keyword(s):

Thin Film ◽

Thin Films ◽

Solar Cell ◽

Optical Absorption ◽

Band Gap ◽

Organic Semiconductors ◽

Low Cost ◽

Organic Thin Film ◽

Vis Spectroscopy ◽

Carbon Based

In this study, we have investigated new tailored organic semiconductors materials for the optoelectronic application, such as organic solar cells. The carbon-based organic semiconductor material has promising advantages in organic thin-film form. Moreover, due to its low cost, organic thin-films are suitable and cheaper than inorganic thin-film. The band gap of organic semiconductors materials can be tuned and mostly lies between 2.0eV to 4eV and the optical absorption edge of organic semiconductors typically lies in between 1.7eV to 3eV. They can be easily tailored by modifying the carbon chain and legends and looks promising for engineering the band gap to harness solar spectrum. In this work, with new tailored organic semiconductors the solution route is explored which is low cost processing method. (Anthracen-9-yl) methylene naphthalene-1-amine, 4-(anthracen-9-ylmethyleneamino)-1,5dimethyl-2-phenyl-1H-pyrazol-3-one and N-(anthracen-9-ylmethyl)-3,4-dimethoxyaniline thin-films are processed by spin coating method with changing concentration such as 0.05 wt% and 0.08 wt%. Thin films of Organic semiconductors were prepared on glass substrate and annealed at 55°C. The structural and optical behaviour of (Anthracen-9-yl) methylene naphthalene-1-amine, 4-(anthracen-9-ylmethyleneamino)-1,5dimethyl-2-phenyl-1H-pyrazol-3-one and N-(anthracen-9-ylmethyl)-3,4-dimethoxyaniline organic semiconductors thin films is studied by X-ray diffraction (XRD), Scanning electron microscopy (SEM) and UV-Visible Spectroscopy technique. The XRD data of synthesized sample suggests the Nano crystallinity of the Organic layers. The SEM micrographs shows the dense packing when we increase the wt% 0.05 to 0.08. Analysis of the optical absorption measurements found that the engineered band gap of synthesized thin films are 2.18eV, 2.35eV, 2.36eV, 2.52eV and 2.65eV which suggest suitability for applications of Optoelectronic devices such as solar cell. Such light weight, eco-friendly and disposable new carbon based materials seems to have potential to replace other traditional hazardous heavy materials for future eco-friendly flat fast electronics. Keywords: Thin-film, solar cell, tailored organic semiconductors, XRD, SEM, UV-Vis spectroscopy.

Download Full-text

A stable and highly sensitive room-temperature liquefied petroleum gas sensor based on nano-cubes/cuboids of zinc antimonate

RSC Advances ◽

10.1039/d0ra02125c ◽

2020 ◽

Vol 10 (34) ◽

pp. 20349-20357 ◽

Cited By ~ 2

Author(s):

Satyendra Singh ◽

Archana Singh ◽

Ajendra Singh ◽

Poonam Tandon

Keyword(s):

Gas Sensor ◽

Room Temperature ◽

Liquefied Petroleum Gas ◽

Sensing Material ◽

Highly Sensitive ◽

Lpg Sensing

A new direction was explored using nanostructured zinc antimonate as a stable and highly sensitive LPG sensing material.

Download Full-text

Fe doping-stabilized γ-Ga2O3 thin films with a high room temperature saturation magnetic moment

Journal of Materials Chemistry C ◽

10.1039/c9tc05823k ◽

2020 ◽

Vol 8 (2) ◽

pp. 536-542 ◽

Cited By ~ 3

Author(s):

Yuanqi Huang ◽

Ang Gao ◽

Daoyou Guo ◽

Xia Lu ◽

Xiao Zhang ◽

...

Keyword(s):

Thin Film ◽

Thin Films ◽

Magnetic Moment ◽

Room Temperature ◽

Fe Doping ◽

Saturation Magnetic Moment ◽

First Time

A thermostable Fe-doped γ-Ga2O3 thin film with a high room temperature saturation magnetic moment of 5.73 μB/Fe has been obtained for the first time.

Download Full-text

Conductimetric Detection of Protein and Cancer Cells with Oxide Nanosensors

MRS Proceedings ◽

10.1557/proc-1010-v06-09 ◽

2007 ◽

Vol 1010 ◽

Author(s):

Janagama Goud ◽

P. Markondeya Raj ◽

Jin Liu ◽

Mahadevan Iyer ◽

Z. L. Wang ◽

...

Keyword(s):

Thin Film ◽

Cancer Cells ◽

Gas Sensing ◽

Low Cost ◽

Electrochemical Techniques ◽

Oxide Thin Film ◽

Thin Film Sensors ◽

Biochemical Sensing ◽

Rabbit Igg ◽

Thin Film Oxides

AbstractSemiconducting oxides are widely known and commercially applied for their gas sensing properties. However, biochemical sensing has mostly depended on optical and electrochemical techniques that are more cumbersome. This work investigates the biosensing characteristics of ZnO nanobelts and ZnO thin films. Zinc oxide thin film sensors showed changes in conductivity after protein functionalization with rabbit IgG and hybridization with anti-rabbit IgG. Conductivity changes were also measured after coating the oxides with MCF-7 cancer cells and its antibodies. In another set of experiments, ZnO nanobelts showed systematic conductivity changes with rabbit IgG protein hybridization. The experimental results in this paper indicate that the conductimetric properties of nano and thin film oxides can be sensitized to protein and cancer cell hybridization reactions. This technique can also be applied to certain other pathogen proteins or toxic proteins from the environment leading to low-cost miniaturized wireless biosensors.

Download Full-text