Also, the chemiresistor gas sensor using Ti 3 C 2 T x MXene according to the present invention exhibits low electrical noise and good response compared to conventional sensors, and thus the signal-to-noise ratio thereof is at least tens of times as high. Thereby, the chemiresistor gas sensor using MXene according to the present invention can be confirmed to possess very high sensitivity. Specifically, the chemiresistor gas sensor using MXene according to the present invention may manifest a signal-to-noise ratio SNR of or more for acetone, or more for ethanol, or more for ammonia, and or more for propanol.
With reference to FIGS. Thereafter, the Ti 3 C 2 T x MXene aqueous solution is subjected to vacuum filtration on an anodized aluminum oxide AAO membrane, thus forming a thin film. Here, in the vacuum filtration process, which is performed in a vacuum, when a vacuum having a vacuum pressure of 0. Here, since the force of the vacuum applied under the porous membrane is strong and is uniformly applied over the entire area of the porous membrane, the Ti 3 C 2 T x MXene particles are uniformly dispersed in the aqueous solution, and are formed into a thin film having a uniform thickness after vacuum filtration.
Thereafter, the aqueous solution is replaced several times with distilled water to thus be neutralized, and the sensor substrate is fixed to the bottom of the container, after which the surface of the aqueous solution is gradually lowered and the thin film is placed on the substrate, followed by drying for about 1 hr, thus completing the transfer process.
The mixing ratio of the BP solution is preferably 0. The mixing ratio of the RGO solution is preferably 0. Since the force of the vacuum applied under the porous membrane is strong and is uniformly applied over the entire area of the porous membrane, the BP, MoS 2 and RGO particles are uniformly dispersed in the aqueous solution, and are formed into respective thin films having a uniform thickness after vacuum filtration.
Thereafter, the aqueous solution is replaced several times with distilled water and thus the aqueous solution is neutralized, and the sensor substrate is fixed to the bottom of the container, after which the surface of the aqueous solution is gradually lowered and each thin film is placed on the substrate, followed by drying for about 1 hr, thereby completing the transfer process. As shown in this drawing, the Ti 3 C 2 T x MXene thin film is uniformly formed on the sensor substrate, and exhibits very high electrical conductivity.
Based on the analysis results, the hydrophilic functional groups are mostly present on the surface of MXene. As shown in FIG. For testing of FIG. The curves in the shaded portion of FIG. As seen in FIGS. Also, as seen in FIGS. In order to evaluate the performance thereof, the chemiresistor gas sensor using Ti 3 C 2 T x MXene according to the present invention was compared with that of conventional sensors using existing 2D materials, such as BP, MoS 2 and RGO.
As shown in this drawing, the chemiresistor gas sensor using Ti 3 C 2 T x MXene according to the present invention can be found to exhibit very low electrical noise compared to the conventional sensors. Specifically, the gas sensor of the present invention shows an SNR as high as about 34 times for acetone, about 33 times for ethanol, about 4 times for ammonia, and 54 times for propanol, compared to the conventional gas sensors using BP, MoS 2 and RGO.
Therefore, the chemiresistor gas sensor using Ti 3 C 2 T x MXene according to the present invention can exhibit low electrical noise and good response and thus an SNR at least tens of times as high as conventional sensors, whereby the chemiresistor gas sensor using MXene has very high sensitivity.
This is considered to be due to the high electrical conductivity of the material. Although the preferred embodiments of the present invention have been disclosed for illustrative purposes with reference to the accompanying drawings, those skilled in the art will appreciate that various modifications and equivalents are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.
Therefore, the scope of the present invention should be determined by the accompanying claims. The present invention pertains to a gas sensor using MXene having excellent electrical conductivity as a channel material, suitable for use in fields in which it is necessary to sensitively detect very low concentrations of molecules, such as in the detection of toxic substances, detection of pollutants, early diagnosis of diseases, etc. The invention claimed is: 1.
A chemiresistor gas sensor, comprising: a substrate;. The chemiresistor gas sensor of claim 1 , wherein a chemical functional group is distributed on a surface of the MXene thin film.
The chemiresistor gas sensor of claim 3 , wherein the chemical functional group of the MXene thin film contains oxygen O , a hydroxyl ion OH , and fluorine F. The chemiresistor gas sensor of claim 1 , wherein the electrodes are formed of a material selected from the group consisting of gold, silver, copper, titanium, carbon nanotubes, graphene, and a conductive polymer.
The chemiresistor gas sensor of claim 1 , wherein the chemiresistor gas sensor is used for sensing at least one gas selected from the group consisting of a volatile organic compound VOC , nerve gas, explosive gas, and food gas. USB2 en. KRB1 en. WOA1 en. Anode for lithium metal battery comprising Nb2C thin film, preparation method thereof and lithium metal battery comprising the same.
Sensor for monitoring composite material liquid forming process and preparation method. KRA en. Preparation method of silver nanowire-MXene composite transparent conductive film. Physical forms of mxene materials exhibiting novel electrical and optical characteristics. Thiolated ligand conjugated MoS2 Chemiresistor gas sensor and fabrication method thereof.
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CC BY. Abstract of research paper on Nano-technology, author of scientific article — Sadanand Pandey Abstract This review article directs particular attention to some current breakthrough developments in the area of gas sensors based on polyaniline PANI nanocomposite.
In the present article, we are specifically focussing on nanocomposites based on conducting polymer PANI in our present review. Distinctive nanocomposite structures were proposed including catalytic inorganic NPs [] In a previous couple of years, different types of sensors have been developing using conducting polymers in different transduction modes.
The change of the electrical conductivity can be because of charge-transfer with the gas molecules or by the mass change due to the physical adsorption of the gas molecules. The film of the sensor was placed in a closed glass chamber and the electrical resistance of the sensor film was measured by a multimeter Keithley meter through two conductive needles when analyte gas was injected into the chamber. The procedure followed for the fabrication of sensing material was provided in figure 6.
It was watched that amazing detecting performance of sensor could most likely be attributed to the synergetic impacts and the moderately high surface area Hydrogen is utilized broadly as a part of scientific research and industry as the fuel for the internal combustion engines, rocket propellant, glass and steel manufacturing, shielding gas in atomic hydrogen welding, and rotor coolant in electrical generators, [61].
A concentration of ppm is known to be immediately dangerous to life or health IDLH [97]. Volatile organic compounds also contribute to climate change and destruction of the ozone layer [, ]. It took about s to reach three orders of magnitude for the value of gas-sensitivity, s to reach five orders and was selective to analogous gasses [].
This can be attributed to decrease in available free volume for vapor permeability into the nanocomposite. PANI-based nanocomposite for CO Detection Carbon monoxide CO is a colorless, odorless, hazardous, and poisonous gas that is produced from industrial processes and is also present in human breath []. PANI-based nanocomposite for explosives, and chemical warfare agents detection At present, as the terrible activities are of high frequency, the detection of explosives and chemical warfare agents CWAs attracts an increasing attention in many fields and is becoming a hot topic for research.
Cyanide detection Cyanide agents are very dangerous compounds that are called "blood agents" and used as chemical warfare agents. Conclusions PANI-based sensors, which convert a chemical interaction into an electrical signal, covering a wide range of applications, have effectively been exhibited as proficient sensors for monitoring organic and inorganic compounds.
Challenges and Future Prospects The response and recovery times and the sensitivity have encountered magnificent enhancement with impressive progress in nanotechnology over the past decades.
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