Graphene embedded echo-wall microsphere cavity monomolecular gas sensor

Abstract

The invention belongs to the field of sensing, and in particular relates to a graphene embedded echo-wall microsphere cavity monomolecular gas sensor based on graphene singular points. According to the invention, the mode volume of microspheres is effectively reduced through gold electrodes on the microspheres, the number of resonant modes is greatly reduced, and the graphene embedded echo-wall microsphere cavity monomolecular gas sensor relies on physical adsorption of graphene and characteristics of the electrically adjustable Fermi level, microsphere cavities can be precisely controlled towork at the singular points through electrically regulated supermaterial graphene to improve the sensing response speed and sensitivity, and furthermore, resonant cavities with high-quality factors can greatly reduce the sensing power consumption: the response time is only one thousandth of that of an electrochemical gas sensor, the sensitivity can be 10,000 or more than 10,000 times that of the traditional optical gas sensor, and the sensing power consumption is as low as 70 nanowatt. Optical fiber communication networks can be conveniently accessed by using common single-mode optical fiber connectors. By adopting the graphene embedded echo-wall microsphere cavity monomolecular gas sensor disclosed by the invention, the sensing sensitivity achieves the monomolecular weight level and the sensing power consumption is lower on the basis of ensuring small sensor size, simple structure and fast response.

Description

technical field [0001] The invention belongs to the field of sensing, and in particular relates to a single-molecule gas sensor with a whispering gallery microsphere cavity embedded in graphene. Based on the singular point of graphene, the gas concentration can be sensed by detecting the splitting width of the transmission spectrum mode. Background technique [0002] With the continuous improvement of people's living standards and the increasing emphasis on environmental protection, the detection of various toxic and harmful gases, the monitoring of air pollution, industrial waste gas, and the detection of food and living environment quality have put forward higher requirements for gas sensors. requirements. The successful application of new material development technologies such as nanometer and thin film technology provides a good prerequisite for the integration and intelligence of gas sensors. High-performance gas sensors can greatly improve the level of information col...

AI Technical Summary

Problems solved by technology

Traditional electrochemical gas sensors generally use chemical electrolysis to sense biochemical molecules with electrolytic current intensity. Although this gas sensing method is relatively mature and reliable, its shortcomings are also very obvious: relying on chemical reactions, High energy consumption, large volume, complex system, weak anti-electromagnetic interference ability, strong gas selectivity, and low sensing sensitivity

In recent years, a batch of electrical sensors based on MEMOS technology have achieved great breakthroughs in terms of volume, energy consumption, and sensitivity, but they still have not solved the problems of slow response speed, complex system, and weak anti-electromagnetic interference ability.

[0004] Optical gas sensors based on optical fiber sensing technology can basically solve the shortcomings of the above-mentioned electrical gas sensors. Compared with traditional electrochemical gas sensors, they have the advantages of simple structure, small size, fast response speed, and anti-electromagnetic interference. The highest sensing sensitivity of the reported optical gas sensor can only reach the ppb level, and its sensing power consumption (microwatt level) is much lower than that of the traditional electrochemical gas sensor, but it is still high.

So far, there is no optical gas sensor with a sensitivity of single molecular weight and a power consumption of nanowatts.

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