The invention provides a rhodium-doped tin dioxide nano-fiber sensitive material acetone sensor prepared on the basis of an electrospinning technique, and a preparation method and application in acetone steam detection aspect in indoor environment and belongs to the technical field of gas sensors. The rhodium-doped tin dioxide nano-fiber sensitive material acetone sensor prepared on the basis of the electrospinning technique comprises an Al2O3 insulated ceramic plate and rhodium ion-doped tin dioxide semiconductor nano-fiber sensitive material films, wherein two separate L-shaped gold electrodes are arranged on the front face of the Al2O3 insulated ceramic plate, a ruthenium oxide heating layer is arranged on the back face of the Al2O3 insulated ceramic plate and two separate rectangular gold electrodes are arranged on the surface of the ruthenium oxide heating layer; and the L-shaped gold electrodes and the front face of the Al2O3 insulated ceramic plate are coated with the rhodium ion-doped tin dioxide semiconductor nano-fiber sensitive material films. Through doping of rhodium ions, the morphological characteristics of tin dioxide semiconductor nano-fiber are changed on the one hand and the electron concentration in the tin dioxide material is reduced on the other hand, so that the sensitivity of the sensor is improved.

Rhodium-doped tin dioxide nano-fiber sensitive material acetone sensor prepared on the basis of electrospinning technique, and preparation method and application of acetone sensor

The invention discloses a sensitive material for detecting formaldehyde and a preparation method and application of the sensitive material. The sensitive material is a reduction graphene oxide-doped tin oxide nanosheet prepared by the steps of adsorbing a tin ligand to the surface of graphene oxide as a template, and carrying out thermal treatment; a mesoporous structure is arranged on the surfaceof the nanosheet; and the specific surface area of the nanosheet reaches 69.8m .g -105.7m .g by virtue of the ultrathin surface and the mesoporous structure on the surface, and more activesites are located on the surface. Therefore, a gas sensitive element in a gas sensor, prepared from the sensitive material, for detecting formaldehyde has the advantages that the formaldehyde sensitivity is high, the interference gas selectivity is good, the response/recovery capability is strong, the detection limit is low, the performance is stable and the like, so that the sensitivity and selectivity of a formaldehyde gas sensor can be effectively improved when the sensitive material is applied to the formaldehyde gas sensor. The sensitive material can be applied to the evaluation of air quality during the indoor and outdoor formaldehyde concentration detection.

Sensitive material for detecting formaldehyde and preparation method and application of sensitive material

The invention relates to a ferric oxide quantum dot enhanced graphene/tin oxide gas sensor and a preparation method thereof The graphene/tin oxide gas sensor is provided with a substrate, a conducting coating film layer, a tin oxide layer, a graphene layer and a ferric oxide quantum dot layer in sequence from bottom to top; the gas sensor is further provided with a first electrode and a second electrode; the first electrode is arranged on the conducting coating film layer; and the second electrode is arranged on the graphene layer The preparation method thereof comprises the following steps: firstly sedimentating the conducting coating film layer on the substrate, and then sedimentating the tin oxide layer; then transferring graphene onto the tin oxide layer; preparing the ferric oxide quantum dot layer on the graphene layer; and finally manufacturing the electrodes on the graphene layer and the conducting coating film layer respectively so as to obtain the gas sensor According to the ferric oxide quantum dot enhanced graphene/tin oxide gas sensor disclosed by the invention, the graphene/tin oxide gas sensor with high conversion efficiency is obtained by using a doping effect introduced with ferric oxide quantum dots

Ferric oxide quantum dot enhanced gas sensor and preparation method thereof

The invention discloses a compound gas sensitive material prepared by compounding different elements doped with graphene quantum dots and a molecular imprinted compound respectively, and a preparation method and application of the compound gas sensitive material. The compound gas sensitive material prepared by compounding different elements doped with the graphene quantum dots and the molecular imprinted compound respectively is prepared from B-GQDs, N-GQDs, S-GQDs, Cl-GQDs and MIALFO (molecular imprinted Ag-LaFeO3), wherein the raw material mass ratio of the B-GQDs to the MIALFO is (0.005-0.05):1; the raw material mass ratio of the N-GQDs to the MIALFO is (0.01-0.05):1; the raw material mass ratio of the S-GQDs to the MIALFO is (0.005-0.05):1; and the raw material mass ratio of the Cl-GQDs to the MIALFO is (0.005-0.03):1. The preparation method comprises the steps of mixing solutions, performing microwave reaction, performing ultrasonic oscillation, drying, grinding, sintering and the like. The compound gas sensitive material is applied to preparation of formaldehyde, acetone, benzene and methanol gas sensitive sensors or gas sensitive test instruments. The invention provides a method for preparing the compound gas sensitive material prepared by compounding different elements doped with graphene quantum dots and the molecular imprinted compound respectively on the basis of the raw materials and proportioning, and a gas sensitive sensor capable of working at low temperature is obtained.

Compound gas sensitive material prepared by compounding different elements doped with graphene quantum dots and molecular imprinted compound respectively, and preparation method and application of compound gas sensitive material

The invention provides a preparation method of a palladium/cobaltosic oxide-graphene thin film for detecting very-low-concentration acetone at low temperature, and belongs to the technical field of gas-sensitive sensors. The preparation method comprises the following steps of mixing ZIF-67 and GO (graphene oxide); modifying by noble metal (palladium); performing heat treatment under air, so as toobtain the palladium/cobaltosic oxide-graphene; preparing a thin film device by a suspension coating method, and performing gas-sensitive testing. After the responses of pure graphene, pure cobaltosicoxide, cobaltosic oxide-graphene and palladium/cobaltosic oxide-graphene to 0.8 ppm acetone at the low temperature of 200 DEG C are compared, the gas-sensitive property of the palladium/cobaltosic oxide-graphene to the acetone is the best, the response value is 31.9, and the response/restoration time is 36 s/72 s. The sensor thin film has the advantages that the preparation method is simple, thecost of the raw material is low, the property of the film is excellent, the working temperature is low, and the good application value and prospect are realized.

Palladium/cobaltosic oxide-graphene thin film for detecting very-low-concentration acetone at low temperature

The invention discloses a gas sensitive material for detecting low-concentration acetone and belongs to the technical field of gas sensitive materials. The gas sensitive material is composed of graphene quantum dot-SnO2, wherein the mass of graphene quantum dots is 5-15% of the total mass of the gas sensitive material. The sensitivity (the ratio of element resistance in the air to element resistance in gas to be detected), to acetone of 0.1 ppm, of an indirectly heated gas sensor prepared with the gas sensitive material as a sensitive material is 1.2-1.5 at the working temperature of 270 DEG C, and the sensitivity to acetone of 1000 ppm is 100-140. Response recovery time is smaller than 50 s. The sensitivity, to methanol, ethanol, methylbenzene, benzene and trimethylamine gas of 1000 ppm, of the element is lower than 4.1 at the same working temperature, and therefore quick detection of low-concentration acetone in the air can be achieved.

Liu Yang

Papers

Gas sensitive material for detecting low-concentration acetone