Hydrogen-sensitive optical element and hydrogen-sensitive optical sensor

Abstract

The invention belongs to the technical field of hydrogen detection, and particularly relates to a hydrogen-sensitive optical element and a hydrogen-sensitive optical sensor. The hydrogen-sensitive optical element comprises a light-transmitting substrate and a hydrogen-sensitive film attached to at least one surface of the light-transmitting substrate, Ag@Pd core-shell type nano-particles are distributed in the hydrogen-sensitive film, and the Ag@Pd core-shell type nano-particles are formed by coating a Pd shell outside an Ag core. According to the hydrogen-sensitive optical element, the Ag@Pd core-shell type nano-particles are attached to the substrate to form the hydrogen-sensitive film, the sensitivity is improved by means of the electronic effect and synergistic effect between Pd and Ag and the large specific surface area of the core-shell type nano-particles, meanwhile, the diffusion distance of hydrogen in the Pd layer is shortened, the response time is greatly shortened, and the modulation effect of the sensor on optical signals is regulated and controlled by flexibly increasing the number of carried hydrogen-sensitive films so that the accuracy of the sensor is improved, and the monitoring range of the sensor is expanded.

Description

technical field [0001] The invention belongs to the technical field of hydrogen detection, in particular to a hydrogen-sensitive optical element and a hydrogen-sensitive optical sensor. Background technique [0002] With the rapid development of industry and the increasing consumption of fossil fuels, the phenomenon of environmental pollution and energy shortage is becoming more and more serious, and the search for alternative clean energy has become an urgent problem to be solved in today's society. Hydrogen has become one of the most important clean energy carriers today because of its high energy density, easy preparation and acquisition, and the combustion product is water, which is non-polluting to the environment. It is widely used in life and industry. [0003] Hydrogen (H 2 ) is a colorless, odorless, flammable, explosive, leaky and rapidly diffusing gas. 2 When the volume concentration reaches 4 to 75%, it is easy to explode. Therefore, in H 2 The preparation, s...

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Problems solved by technology

Among them, the semiconductor type sensor has a fast response speed, but there are certain safety hazards in the operation in a high temperature environment, and it cannot achieve accurate measurement; the catalytic combustion type sensor is heated to several hundred degrees to detect H 2 The current signal generated during combustion also works in a high-temperature operating environment, with high power consumption, easy poisoning, and low stability; electrochemical sensors can detect ppm-level H 2 concentration, but poor environmental adaptability and short life; optical hydrogen-sensitive optical sensors use light as an information carrier, and use the changes in physical properties of the hydrogen-sensitive material mounted on the sensor after absorbing hydrogen to modulate the optical signal to obtain the measured environment Medium H 2 Concentration-related information, with safety, anti-electromagnetic interference, and anti-corrosion, is an ideal sensor for leak monitoring in dangerous and complex closed environments, and has a very wide application prospect. However, the optical coupling modulation capability of hydrogen-sensitive materials currently Low, which restricts the sensitivity of optical hydrogen-sensitive optical sensors. At the same time, due to the immature preparation process, the consistency of hydrogen-sensitive materials is poor and unstable, which limits the response speed of optical hydrogen-sensitive optical sensors.

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