PEDOT:PSS/GO NANOCOMPOSITE FOR INDOOR CO2 SENSOR

Carbon dioxide (CO2) which is a colourless and odourless gas, requires an efficient detection, as excessive amount in the environment would possibly leads to global warming. This work discusses on an environmentally friendly and non-toxic CO2 sensor for indoor air monitoring. The fabricated sensor is developed by using poly(3,4ethylenedioxythiophene):poly(4styrenesulfonate)/ graphene oxide (PEDOT:PSS/GO) nanocomposite. Nanocomposite characterisations are performed by using field-emission scanning electron microscope (FESEM) and X-ray diffraction (XRD) to confirm excellent properties of PEDOT:PSS and GO as suitable materials for CO2 sensor development. Fabrication of one layer PEDOT:PSS/GO nanocomposite on environmentally friendly kaolin-coated paper substrate via dip coating method shows good electrical conductivity of 0.25 S. At room temperature, at fixed CO2 flow rate of 0.05 l/min, the fabricated sensor response time is 32 s, with sensor response and sensitivity of 0.8 and 16/l/min respectively. With fast chemiresistive response towards CO2 molecules, the fabricated sensor provides promising results for indoor CO2 monitoring.

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Nanostructured SnO2–ZnO composite gas sensors for selective detection of carbon monoxide

Beilstein Journal of Nanotechnology ◽

10.3762/bjnano.7.195 ◽

2016 ◽

Vol 7 ◽

pp. 2045-2056 ◽

Cited By ~ 21

Author(s):

Paul Chesler ◽

Cristian Hornoiu ◽

Susana Mihaiu ◽

Cristina Vladut ◽

Jose Maria Calderon Moreno ◽

...

Keyword(s):

Research Group ◽

Gas Sensing ◽

Porous Alumina ◽

Sol Gel ◽

High Sensitivity ◽

Dip Coating ◽

Sensor Response ◽

Coating Method ◽

Dip Coating Method ◽

Sensing Performance

A series of SnO2–ZnO composite nanostructured (thin) films with different amounts of SnO2 (from 0 to 50 wt %) was prepared and deposited on a miniaturized porous alumina transducer using the sol–gel and dip coating method. The transducer, developed by our research group, contains Au interdigital electrodes on one side and a Pt heater on the other side. The sensing films were characterized using SEM and AFM techniques. Highly toxic and flammable gases (CO, CO2, CH4, and C3H8) were tested under lab conditions (carrier gas was dry air) using a special gas sensing cell developed by our research group. The gas concentrations varied between 5 and 2000 ppm and the optimum working temperatures were in the range of 210–300 °C. It was found that the sensing performance was influenced by the amount of oxide components present in the composite material. Improved sensing performance was achieved for the ZnO (98 wt %)–SnO2 (2 wt %) composite as compared to the sensors containing only the pristine oxides. The sensor response, cross-response and recovery characteristics of the analyzed materials are reported. The high sensitivity (R S = 1.21) to low amounts of CO (5 ppm) was reported for the sensor containing a composite sensitive film with ZnO (98 wt %)–SnO2 (2 wt %). This sensor response to CO was five times higher as compared to its response to CO2, CH4, and C3H8, thus the sensor is considered to be selective for CO under these test conditions.

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Porous Gel Coatings Obtained by Phase Separation in ORMOSIL System

MRS Proceedings ◽

10.1557/proc-628-cc7.6 ◽

2000 ◽

Vol 628 ◽

Cited By ~ 1

Author(s):

Kazuki Nakanishi ◽

Souichi Kumon ◽

Kazuyuki Hirao ◽

Hiroshi Jinnai

Keyword(s):

Phase Separation ◽

Reaction Time ◽

Volume Fraction ◽

Sol Gel ◽

Reaction Times ◽

Dip Coating ◽

Coating Solution ◽

Coating Method ◽

Gel Phase ◽

Dip Coating Method

ABSTRACTMacroporous silicate thick films were prepared by a sol-gel dip-coating method accompanied by the phase separation using methyl-trimethoxysilane (MTMS), nitric acid and dimethylformamide (DMF) as starting components. The morphology of the film varied to a large extent depending on the time elapsed after the hydrolysis until the dipping of the coating solution. On a glass substrate, the films prepared by early dipping had inhomogeneous submicrometer-sized pores on the surface of the film. At increased reaction times, relatively narrow sized isolated macropores were observed and their size gradually decreased with the increase of reaction time. On a polyester substrate, in contrast, micrometer-sized isolated spherical gel domains were homogeneously deposited by earlier dippings. With an increase of reaction time, the volume fraction of the gel phase increased, then the morphology of the coating transformed into co-continuous gel domains and macropores, and finally inverted into the continuous gel domains with isolated macropores. The overall morphological variation with the reaction time was explained in terms of the phase separation and the structure freezing by the forced gelation, both of which were induced by the evaporation of methanol during the dipping operation.

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Preparation of Polypropylene/PVDF Composite Membrane by Dip-Coating Method

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/1115/1/012028 ◽

2021 ◽

Vol 1115 (1) ◽

pp. 012028

Author(s):

P T P Aryanti ◽

G Trilaksono ◽

A Hotmaida ◽

M A Afifah ◽

F P Pratiwi ◽

...

Keyword(s):

Composite Membrane ◽

Dip Coating ◽

Coating Method ◽

Dip Coating Method

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Characterization of UHMWPE- HAp coating produced by dip coating method on Ti6Al4V alloy

Surface and Coatings Technology ◽

10.1016/j.surfcoat.2021.127091 ◽

2021 ◽

pp. 127091

Author(s):

Gözde Çelebi Efe ◽

Elif Yenilmez ◽

İbrahim Altinsoy ◽

Serbülent Türk ◽

Cuma Bindal

Keyword(s):

Dip Coating ◽

Ti6al4v Alloy ◽

Coating Method ◽

Dip Coating Method

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Effect of annealing temperature on structural and optical properties of nickel oxide thin films by dip coating method

10.1063/5.0029961 ◽

2020 ◽

Author(s):

Latha Jithendrakumar Meenakshi ◽

Balakrishnan Remani Aswathy ◽

Poonthamannil Karunakarapanicker Manoj

Keyword(s):

Thin Films ◽

Optical Properties ◽

Nickel Oxide ◽

Annealing Temperature ◽

Dip Coating ◽

Oxide Thin Films ◽

Structural And Optical Properties ◽

Coating Method ◽

Dip Coating Method ◽

Nickel Oxide Thin Films

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The Effect of Film Thickness and Content on Film Formation from PS/ Nanocomposites Prepared by Dip-Coating Method

Journal of Nanomaterials ◽

10.1155/2012/524343 ◽

2012 ◽

Vol 2012 ◽

pp. 1-17 ◽

Cited By ~ 3

Author(s):

M. Selin Sunay ◽

Onder Pekcan ◽

Saziye Ugur

Keyword(s):

Film Thickness ◽

Elevated Temperatures ◽

Film Formation ◽

Fluorescence Emission ◽

Dip Coating ◽

Atomic Force ◽

Annealing Step ◽

Coating Method ◽

Fluorescence Emission Intensity ◽

Dip Coating Method

Steady-state fluorescence (SSF) technique in conjunction with UV-visible (UVV) technique and atomic force microscope (AFM) was used for studying film formation from TiO2covered nanosized polystyrene (PS) latex particles (320 nm). The effects of film thickness and TiO2content on the film formation and structure properties of PS/TiO2composites were studied. For this purpose, two different sets of PS films with thicknesses of 5 and 20 μm were prepared from pyrene-(P-) labeled PS particles and covered with various layers of TiO2using dip-coating method. These films were then annealed at elevated temperatures above glass transition temperature () of PS in the range of 100–280°C. Fluorescence emission intensity, from P and transmitted light intensity, were measured after each annealing step to monitor the stages of film formation. The results showed that film formation from PS latexes occurs on the top surface of PS/TiO2composites and thus developed independent of TiO2content for both film sets. But the surface morphology of the films was found to vary with both TiO2content and film thickness. After removal of PS, thin films provide a quite ordered porous structure while thick films showed nonporous structure.

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Preparation and properties of polyurethane coatings modified by polysilazane

High Performance Polymers ◽

10.1177/0954008319891758 ◽

2019 ◽

Vol 32 (6) ◽

pp. 611-619 ◽

Cited By ~ 1

Author(s):

Xiaoli Liu ◽

Zhen Ge ◽

Wenguo Zhang ◽

Yunjun Luo

Keyword(s):

Mechanical Property ◽

Photoelectron Spectroscopy ◽

Composite Coatings ◽

Composite Films ◽

Dip Coating ◽

Water Contact ◽

Research Attention ◽

Elongation At Break ◽

Coating Method ◽

Dip Coating Method

Due to their unique physicochemical properties, polysilazanes exhibit excellent performance when combined with some resin matrixes, which had drawn great research attention. In this article, polyurethane (PU) was firstly prepared by polytetrahydrofuran glycol, isophorone diisocyanate, and 1,4-butanediol as main materials. Then, the prepared PU was blended with polysilazane by mixing the two solutions together, which was cured to films via dip-coating method at room temperature. The structure, thermal stability, and surface properties of the composite coatings were investigated by Fourier-transform infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy, and X-ray photoelectron spectroscopy. The results demonstrated that after modification with polysilazane, the heat resistance, hydrophobicity, and mechanical property of the PU coatings were improved. When the content of polysilazane was 6 wt%, the mechanical property of the composite films was optimized, with a maximum tensile strength of 25.7 MPa and elongation at break of 797%. Meanwhile, the water contact angle of the composite film was 107° and the water absorption reached a minimum of 2.1%, which showed improved hydrophobicity and water resistance.

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