A fast response method of graphene gas sensor based on bandwidth enhancement technology

A gas sensor, fast response technology, applied in the direction of material resistance, can solve the problems of long sensor response time, poor response characteristics, long time consumption, etc., to achieve high amplitude recognition accuracy, avoid pollution, and improve the effect of measurement accuracy

Active Publication Date: 2020-08-04
BEIHANG UNIV
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Problems solved by technology

[0003] However, graphene gas sensors still face many problems
When graphene is used to sense gas in the time domain, the gas adsorption-desorption process takes a long time, resulting in long sensor response time and poor response characteristics
Moreover, the baseline drift caused by using graphene as a gas sensor has been a major obstacle for graphene as a gas sensor

Method used

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  • A fast response method of graphene gas sensor based on bandwidth enhancement technology
  • A fast response method of graphene gas sensor based on bandwidth enhancement technology
  • A fast response method of graphene gas sensor based on bandwidth enhancement technology

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Embodiment Construction

[0025] The method of the present invention will be further specifically described below in conjunction with the accompanying drawings and specific implementation methods. These and other aspects of the example embodiments herein will be better appreciated and understood when taken in conjunction with the description below. The following description is for purposes of illustration and not limitation. Various changes and modifications may be made within the scope of the exemplified embodiments herein without departing from the spirit of the invention. In the interest of clarity, not all features of an actual implementation are described in this specification.

[0026] The present invention provides a kind of graphene gas sensor rapid response method based on bandwidth enhancement technology, described method comprises the steps:

[0027] Step 1, the gas to be detected passes through the graphene gas sensor, and after passing through the lock-in amplifier, the measurement data ...

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Abstract

The invention discloses a rapid response method for a graphene gas sensor on the basis of a bandwidth enhancement technique, and belongs to the technical field of graphene sensors. The method comprises the following steps: detected gas passes through the graphene gas sensor and is treated by a lock-in amplifier, and measured data is obtained by a data acquisition module; the measured data is subdivided into multiple groups of data in time domain by multi-stage extraction; power spectral density of each group of data is estimated; partial noise power spectral densities of the estimated power spectral densities in a sensitive frequency range are selected, average power of each group of data is obtained by integration, and a time-domain power diagram is obtained by combining the average power; the time-domain power diagram is subjected to wavelet transform. The measured data is processed in real time on the basis of the bandwidth enhancement technique, so that the response characteristicof the graphene gas sensor is improved substantially, and the sensor can response rapidly when the gas enters the sensor module; the sensor can restore the initial state rapidly when the gas leaves the sensor module, and a baseline hardly has any drifting.

Description

technical field [0001] The invention belongs to the technical field of graphene sensors, in particular to a method for realizing fast response of graphene gas sensors based on bandwidth enhancement technology. Background technique [0002] Graphene has unique material properties in that it is two-dimensional and has extremely stable covalent bonds. Due to the weak interaction of the van der Waals force and the charge scattering mechanism upon exposure to chemicals, utilizing graphene can provide a highly sensitive gas sensing solution at room temperature. Vapors of different chemicals have significantly different effects on graphene's low-frequency noise spectrum, the study showed. Therefore, research on sensors using graphene as a sensitive element emerges in an endless stream. [0003] However, graphene gas sensors still face many problems. When graphene is used to sense gas in the time domain, the gas adsorption-desorption process takes a long time, resulting in long r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
CPCG01N27/12
Inventor 崔勇李丹阳
Owner BEIHANG UNIV
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