Method for preparing lanthanum cobaltate-doped nanorod array gas-sensitive sensor

A technology of nanorod array and gas sensor, which is applied in the field of preparation of doped lanthanum cobaltate nanorod array gas sensor, which can solve the problem that the lanthanum cobaltate carbon monoxide gas sensor cannot be used at room temperature, so as to improve the response recovery speed , increase the contact area, improve the effect of responsiveness

Active Publication Date: 2015-01-28
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0004] The problem to be solved by the present invention is to overcome the technical bottleneck that the lanthanum cobaltate carbon monoxide gas sensor cannot be used at room temperature in the prior art, and provide a high-quality, in-situ method for preparing a carbon monoxide room temperature sensor doped with lanthanum cobaltate nanorod arrays

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  • Method for preparing lanthanum cobaltate-doped nanorod array gas-sensitive sensor
  • Method for preparing lanthanum cobaltate-doped nanorod array gas-sensitive sensor

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preparation example Construction

[0014] Such as figure 1 As shown, a method for preparing a doped lanthanum cobaltate nanorod array gas sensor provided by the present invention specifically comprises the following steps:

[0015] (1) Sensor substrate preparation:

[0016] Selected substrates: including silicon substrates, alumina ceramic substrates, glass substrates, preferably silicon substrates. The substrate was ultrasonically washed alternately in ethanol and acetone solutions to remove surface stains, and then the substrate was taken out and placed in deionized water to clean the residual organic solution. The substrate after the above pretreatment is placed in an ion sputtering apparatus, and a layer of metal conductive electrodes, such as gold, silver, platinum, preferably gold, is sputtered by mask lithography to obtain a sensor substrate.

[0017] (2) Preparation of lanthanum cobaltate seed crystals:

[0018] Dissolve cobalt salt and lanthanum salt with a molar ratio of Co / La=(0.8~1.2):1 in deioni...

example 1

[0030] Select a silicon substrate. The silicon substrate was ultrasonically washed three times in ethanol and acetone solutions alternately for 10 minutes each to remove surface stains, and then the substrate was taken out and placed in deionized water to clean the residual organic solution. Put the above-mentioned pretreated substrate into an ion sputtering apparatus, and sputter a layer of gold conductive electrodes by mask photolithography.

[0031] Co(NO 3 ) 2 ·6H 2 O and La(NO 3 ) 3 ·6H 2 Dissolve O in deionized water, then add hydrogen peroxide that is equimolar to Co, then add NaOH to pH = 11 to obtain a precipitate, filter the precipitate and wash with deionized water until pH = 7, dry in an oven at 70°C for 3 hours, and then in a muffle The lanthanum cobaltate nanoparticles were obtained by calcining in a furnace at 600°C for 4 hours. Add the prepared lanthanum cobaltate nanoparticles into ethylene glycol, control the concentration of lanthanum cobaltate to 50g...

example 2

[0036] Select a glass substrate. The glass substrate was ultrasonically washed three times in ethanol and acetone solutions alternately for 10 minutes each to remove surface stains, and then the substrate was taken out and placed in deionized water to clean the residual organic solution. Put the above-mentioned pretreated substrate into an ion sputtering apparatus, and sputter a layer of silver conductive electrodes by mask photolithography.

[0037] CoCl with molar ratio Co / La=1.2 2 ·6H 2 O and LaCl 3 ·7H 2 Dissolve O in deionized water, then add hydrogen peroxide that is equimolar to Co, then add KOH to pH = 12 to obtain a precipitate, filter the precipitate and wash with deionized water to pH = 7, dry it in an oven at 90°C for 1 hour, and then in a muffle The lanthanum cobaltate nanoparticles were obtained by calcining in a furnace at 750° C. for 8 hours. Add the prepared lanthanum cobaltate nanoparticles into isopropanol, control the concentration of lanthanum cobalta...

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Abstract

The invention discloses a method for preparing a lanthanum cobaltate-doped nanorod array gas-sensitive sensor. The method is suitable for preparing lanthanum cobaltate nanorod array gas-sensitive sensors doped with elements such as strontium, cerium and palladium. The method comprises the following steps: preparing a nanorod array template by adopting an anodic oxidation method, forming a lanthanum cobaltate-doped nanorod on the template by adopting a sol-gel method, and contacting the nanorod with an electrode substrate by adopting a seed crystal method. According to the method, the morphology of the nanorod can be remained in an undamaged mode, and carbon monoxide can be well responded at room temperature. The room temperature carbon monoxide sensor prepared by adopting the method is simple in structure and excellent in performance.

Description

technical field [0001] The invention belongs to the field of gas sensor preparation, and in particular relates to a method for preparing a doped lanthanum cobaltate nanorod array gas sensor. The invention can rapidly and high-quality prepare the doped lanthanum cobaltate nanorod array gas sensor. Background technique [0002] Lanthanum cobaltate (LaCoO 3 ) material is a typical ABO 3 Type perovskite composite oxides have the advantages of high dielectric constant, low loss, good thermal stability and excellent catalytic activity. These advantages make it a widely used electronic functional ceramic material, which is widely used in many fields such as sensors, fuel cell electrodes, oxidative dehydrogenation, photocatalysis, and three-way catalysts. The current research on lanthanum cobaltate shows that lanthanum cobaltate can have a better catalytic effect on carbon monoxide at a lower temperature (less than 200 degrees Celsius). Since the catalytic reaction principle is s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/00C01G51/00B82Y30/00B82Y40/00
Inventor 郭新丁俊超李华曜
Owner HUAZHONG UNIV OF SCI & TECH
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