A whispering gallery microsphere cavity single-molecule gas sensor embedded in graphene

Abstract

The invention belongs to the field of sensing, in particular to a graphene-embedded whispering gallery microsphere cavity single-molecule gas sensor, which is based on the graphene singularity. The present invention effectively reduces the mode volume of the microsphere through the gold electrode on the microsphere, greatly reduces the number of resonance modes, and relies on the physical adsorption of graphene and the characteristics of the electrically adjustable Fermi level, and the supermaterial graphene can be electrically regulated Precisely control the microsphere cavity to work at the singular point, improve the sensing response speed and sensitivity, and the resonant cavity with high quality factor can greatly reduce the sensing power consumption: the response time is only one thousandth of the electrochemical gas sensor, The sensitivity can reach more than 10,000 times that of traditional optical gas sensors, and the sensing power consumption is as low as 70 nanowatts. The joint of ordinary single-mode optical fiber can be easily connected to the optical fiber communication network. On the basis of ensuring small volume, simple structure and fast response of the sensor, the invention realizes the sensing sensitivity reaching single molecular weight level and has lower sensing power consumption.

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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