For the rapid development of the hydrogen economy,a reliable and low-cost hydrogen sensor appears to be extremely important.Here,we first show that a palladium film deposited on polydimethylsiloxane(PDMS)can obtain an...For the rapid development of the hydrogen economy,a reliable and low-cost hydrogen sensor appears to be extremely important.Here,we first show that a palladium film deposited on polydimethylsiloxane(PDMS)can obtain an exceedingly high-reflectance contrast of 25.78 over the entire visible band upon exposure to 4 vol% hydrogen gas(H2)mixed with nitrogen gas.This high-reflectance contrast results from the surface deformation induced by the volume inflation after exposure to H2,leading to the transition of the near-specular surface to a diffusing surface.In addition,a change in brightness is readable by naked eye upon exposure to H2 with various concentrations from 0.6 to 1 vol% under the illumination of a fluorescent tube.Furthermore,this sensor possesses an excellent recyclability and quick response time of a few seconds.Compared with Pd nanostructure-based hydrogen sensors,this visual,high-contrast and low-cost sensor is of great potential for practical hydrogen sensing.展开更多
基金the financial support from the National Natural Science Foundation of China(11574406,11504437,11874436,61604179,and 11374376)the Key Project of the NSF of Guangdong Province(no.2016A030311049)the Fundamental Research Funds for the Central Universities(no.17lgpy07).
文摘For the rapid development of the hydrogen economy,a reliable and low-cost hydrogen sensor appears to be extremely important.Here,we first show that a palladium film deposited on polydimethylsiloxane(PDMS)can obtain an exceedingly high-reflectance contrast of 25.78 over the entire visible band upon exposure to 4 vol% hydrogen gas(H2)mixed with nitrogen gas.This high-reflectance contrast results from the surface deformation induced by the volume inflation after exposure to H2,leading to the transition of the near-specular surface to a diffusing surface.In addition,a change in brightness is readable by naked eye upon exposure to H2 with various concentrations from 0.6 to 1 vol% under the illumination of a fluorescent tube.Furthermore,this sensor possesses an excellent recyclability and quick response time of a few seconds.Compared with Pd nanostructure-based hydrogen sensors,this visual,high-contrast and low-cost sensor is of great potential for practical hydrogen sensing.
