A fast response/recovery graphene‑cotio 3 Preparation method of composite sensitive material

A fast-response, compound-sensitive technology, applied in the analysis of materials, material resistance, chemical instruments and methods, etc., can solve the problems of high minimum gas concentration, slow response speed, high working temperature, etc., and achieve fast carrier mobility, good Effects of thermal conductivity and high light transmittance

Active Publication Date: 2017-07-28
SHAANXI UNIV OF SCI & TECH
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  • Application Information

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Problems solved by technology

[Lu J, Jiang Y, Zhang Y, et al. Preparation of gas sensing CoTiO 3 nanocrystallites using EDTA as the chelating agent in a sol–gel process[J].Ceramics International,2015,41(3):3714-3721.], cobalt titanate as a gas-sensing material currently has the main problem: the working temperature is relatively high High, the minimum detectable gas concentration is high, and there are problems such as slow response speed

Method used

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  • A fast response/recovery graphene‑cotio <sub>3</sub> Preparation method of composite sensitive material
  • A fast response/recovery graphene‑cotio <sub>3</sub> Preparation method of composite sensitive material
  • A fast response/recovery graphene‑cotio <sub>3</sub> Preparation method of composite sensitive material

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Experimental program
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Effect test

Embodiment 1

[0023] 1) Add 3.125mg of graphene oxide to 3.125mL of ethanol, the concentration of graphene oxide in ethanol is 1mg / mL, ultrasonic 1.5h, ultrasonic power is 60Hz, graphene oxide is uniformly dispersed in ethanol to obtain Graphene oxide ethanol solution.

[0024] 2) Add 0.005molCo(NO 3 ) 2 ·6H 2 O was completely dissolved in 15mL C 2 h 5 OH, stirred at room temperature to obtain a uniform red transparent solution, denoted as A, at this time Co 2+ The concentration is 0.00033 mol / mL.

[0025] 3) Add 1 drop of analytically pure glacial acetic acid to A, adjust the pH value of the solution to 2.0, and obtain a reddish-brown solution, denoted as B.

[0026] 4) Slowly pour B into 0.005mol analytically pure Ti(OC 4 h 9 ) 4 In, and constantly stirring, a red transparent sol was obtained, which was recorded as C.

[0027] 5) Slowly add 3.125mL of graphene oxide ethanol solution into the above-mentioned red transparent sol, stir for 24h, and the stirring rate is 70r / min to o...

Embodiment 2

[0030] 1) Add 12.5 mg of graphene oxide to 12.5 mL of ethanol, the concentration of graphene oxide in ethanol is 1 m g / mL, ultrasonic 1.5h, ultrasonic power 60Hz, uniformly disperse graphene oxide in ethanol to obtain graphene oxide ethanol solution.

[0031] 2) Weigh 0.005molCo(NO 3 ) 2 ·6H 2 O was completely dissolved in 15mL C 2 h 5 OH, stirred at room temperature to obtain a uniform red transparent solution, denoted as A, at this time Co 2+ The concentration is 0.00033 mol / mL.

[0032] 3) Add 1 drop of analytically pure glacial acetic acid to A, adjust the pH value of the solution to 3.0, and obtain a reddish-brown solution, denoted as B.

[0033] 4) Slowly pour B into 0.005mol analytically pure Ti(OC 4 h 9 ) 4 In, and constantly stirring, a red transparent sol was obtained, which was recorded as C.

[0034] 5) Slowly add 12.5 mL of graphene oxide ethanol solution into the above-mentioned red transparent sol, stir for 24 hours, and the stirring rate is 70r / min to...

Embodiment 3

[0037] 1) The graphene oxide that weighs 31.25mg is added in the ethanol of 31.25mL, the graphene oxide in ethanol 浓 The concentration range is 1mg / mL, ultrasonic 1.5h, ultrasonic power is 60Hz, graphene oxide is uniformly dispersed in ethanol to obtain graphene oxide ethanol solution.

[0038] 2) Weigh 0.005molCo(NO 3 ) 2 ·6H 2 O was completely dissolved in 15mL C 2 h 5 OH, stirred at room temperature to obtain a uniform red transparent solution, denoted as A, at this time Co 2+ The concentration is 0.00033 mol / mL.

[0039] 3) Add 1 drop of analytically pure glacial acetic acid to A, adjust the pH value of the solution to 4.0, and obtain a reddish-brown solution, which is denoted as B.

[0040] 4) Slowly pour B into 0.005mol analytically pure Ti(OC 4 h 9 ) 4 In, and constantly stirring, a red transparent sol was obtained, which was recorded as C.

[0041] 5) Slowly add 31.25 mL of graphene oxide solution into the above-mentioned red transparent sol, stir for 24 hour...

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Abstract

The invention provides a preparation method for a rapid response / restoration graphene-CoTiO3 composite sensitive material. The preparation method comprises the following steps: uniformly dispersing graphene oxide in ethanol so as to obtain a graphene oxide ethanol solution, dissolving Co(NO3)2.6H2O in C2H5OH, carrying out stirring at room temperature so as to obtain a red transparent solution and adjusting the pH value of the red transparent solution to 2.0 to 5.0 so as to obtain a red brown solution; adding the red brown solution into Ti(OC4H9)4 so as to obtain red transparent sol; adding the graphene oxide ethanol solution into the red transparent sol and carrying out stirring so as to obtain sol; and drying the sol and then calcining the sol at 600 to 700 DEG C for 1 to 3 h. According to the invention, chemical bonding between CoTiO3 and a graphene flaky layer is realized, and the composite sensitive material is capable of shortening response and restoration time. Experimental results prove that the composite sensitive material is sensitive to ethanol gas, has rapid response / restoration capability and can be used in a sensitive material.

Description

technical field [0001] The invention relates to the preparation of a sensitive material, in particular to a fast response / recovery graphene-CoTiO 3 Preparation method of composite sensitive material. Background technique [0002] Gas-sensitive materials refer to a class of functional materials whose electrical resistance changes with changes in the surrounding gas environment. Gas sensors play a very important role in life and are widely used in environmental monitoring, factory production and safety monitoring, and medical diagnosis. [Varghese S S, Lonkar S, Singh K K, et al.Recent advances ingraphene based gas sensors[J].Sensors and Actuators B:Chemical,2015,218:160-183.]. [0003] Ilmenite type compound CoTiO 3 It has the properties of storage, recording, catalysis and sensitivity to ethanol, and can be applied in the fields of lithium-ion batteries, magnetic recorders, catalysts and gas sensors. Among them, the gas sensitivity of cobalt titanate has attracted more an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/00G01N27/12
CPCC01G51/00C01P2002/82C01P2004/03C01P2004/80G01N27/127
Inventor 卢靖贾娜程龙黄剑锋曹丽云王勇
Owner SHAANXI UNIV OF SCI & TECH
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