Preparation method of electronic ammonia gas sensor based on non-covalent monatomic layer graphene

A single atomic layer graphite and ammonia sensor technology, applied in the field of sensors and nanomaterials, can solve the problems of low selectivity and sensitivity, hinder application, poor stability, etc., and achieve good sensitivity and selectivity, good stability and The effect of service life and good mechanical properties

Inactive Publication Date: 2020-12-04
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Conventional ammonia sensors are mainly based on metal oxides, such as tin oxide, but these sensors have some inherent deficiencies, such as relatively low selectivity and sensitivity, poor stability, and the need for high temperatures to recover the gas sensor to the initialization state, these deficiencies greatly hinder its application in various fields

Method used

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  • Preparation method of electronic ammonia gas sensor based on non-covalent monatomic layer graphene
  • Preparation method of electronic ammonia gas sensor based on non-covalent monatomic layer graphene
  • Preparation method of electronic ammonia gas sensor based on non-covalent monatomic layer graphene

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Experimental program
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Effect test

Embodiment 1

[0037] Step 1, preparing a graphene device with a field effect transistor structure

[0038] Using existing electron beam lithography and oxygen plasma etching techniques to fabricate graphene ribbons from chemical vapor deposited single-layer graphene, figure 1 The scanning electron microscope image and the Raman spectrogram of single-layer graphene are provided, and the substrate material of graphene is silicon dioxide and silicon (see image 3 ), with a gate electrode on the substrate. The source and drain electrodes of the graphene ribbons are then prepared using existing electron beam lithography and metal deposition methods, thereby realizing the electrical linkage of the graphene ribbons. Graphene ribbons with source, drain, and gate electrodes constitute a graphene device with a field-effect transistor structure. The electrode material is metallic gold with a thickness of 70 nanometers. Graphene ribbons act as channels with dimensions of 40 microns in length and 10 ...

Embodiment 2

[0048] The difference between this embodiment and embodiment 1 is that in step 3, the graphene device having a field effect transistor structure is immersed in the BP2T molecular solution for 2 hours.

[0049] The ammonia gas sensor test of the electronic ammonia gas sensor obtained in this embodiment shows that the ammonia gas response time is 250 seconds, and the recovery time of the gas sensor to the initial state is 200 seconds without any additional treatment. Depend on Figure 8 It can be seen that the electronic gas sensor obtained with an immersion time of 2 hours has the highest sensitivity, which is three times that of intrinsic graphene. Since the intrinsic graphene ammonia sensitivity is 1ppm, the obtained electronic ammonia sensor based on non-covalent functionalized single atomic layer graphene has a sensitivity of 300ppb level.

Embodiment 3

[0051] The difference between this embodiment and embodiment 1 is:

[0052] The graphene ribbons prepared in step 1 have a length of 50 microns and a width of 50 microns.

[0053] The electrode material gold in step 1 has a thickness of 120 nanometers.

[0054] In step 2, the mass volume ratio of BP2T to toluene is 1:2, and 7 mg of BP2T powder is dissolved in 14 ml of toluene.

[0055] Step 3 is to immerse the graphene device with the field effect transistor structure in the BP2T molecular solution for 5 hours.

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Abstract

The invention relates to a preparation method of an electronic ammonia gas sensor based on non-covalent monatomic layer graphene, which comprises the following steps: (1) preparing graphene into a graphene belt, wherein a substrate of the graphene is provided with a gate electrode, and the graphene belt is used as a channel; then preparing a source electrode and a drain electrode on the graphene belt to obtain a graphene device with a field effect transistor structure; (2) dissolving BP2T powder into methylbenzene to obtain a BP2T molecular solution; and (3) immersing the graphene device withthe field effect transistor structure in the BP2T molecular solution, carrying out non-covalent functionalization treatment, taking out the graphene device, washing the graphene device with toluene, and blow-drying the graphene device to obtain the electronic ammonia gas sensor. The method is simple, the prepared electronic ammonia gas sensor has good selectivity and high ppb grade sensitivity toammonia gas, meanwhile, the recovery process is very simple, the sensor can automatically recover to the initial state after ammonia gas detection is stopped, the sensitivity is high, and the practicability is high.

Description

technical field [0001] The invention relates to an electronic ammonia sensor based on non-covalent functionalized monoatomic layer graphene for ammonia detection, which belongs to the technical field of sensors and nanometer materials. Background technique [0002] Graphene has been widely regarded as an ideal material for solid-state gas sensors due to its excellent electrical properties, large specific surface area, high mechanical strength, and good chemical stability. Specifically, graphene's high electrical conductivity ensures that it exhibits minimal signal disturbance when used as a sensor, while its high chemical stability and high mechanical properties ensure an extremely long lifetime for such sensors. The inherent two-dimensional structure of graphene provides it with a large specific surface area, thus ensuring extremely high sensitivity. Despite the high sensitivity and potential of graphene gas sensors, the inert surface properties of graphene pose a great ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 李虎刘江伟段天博
Owner SHANDONG UNIV
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