Ultrasensitive Plasmonic Response of Bimetallic Au/Pd Nanostructures to Hydrogen
Ultrasensitive Plasmonic Response of Bimetallic Au/Pd Nanostructures to Hydrogen
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双金属 Au/Pd 纳米结构对氢的超灵敏等离子体响应
DOI：
10.1002/adfm.201402091
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发表时间：
2014-12-10
影响因子：
19
通讯作者：
Jin, Chongjun
中科院分区：
文献类型：
--
作者：
Jiang, Ruibin;Qin, Feng;Jin, Chongjun
氢气检测对于所有氢气相关应用的安全性至关重要。与通常遭受可能的电火花的电氢传感器相比，光学氢传感器具有远程和非接触式读数的优点，因此避免了火花的产生。在此，报道了对氢表现出超灵敏等离子体激元响应的双金属Au/Pd纳米结构单层。制备了具有连续和不连续Pd壳层的双金属Au/Pd纳米结构。通过测量沉积在载玻片上的系综Au/Pd纳米结构的消光光谱来监测对氢的等离子体激元响应。氢的引入诱导红色等离子体激元位移，其对于具有较厚Pd壳的纳米结构变得更大。对于具有连续Pd壳层的纳米结构，在低于爆炸极限的氢气体积浓度下，等离子体位移可以达到56 nm。等离子体激元共振波长显示出对低于1%的氢体积浓度的良好线性依赖性。实验中的检出限达到0.2%。具有不连续Pd壳的纳米结构比具有连续Pd壳的纳米结构显示出更小的等离子体位移。对支撑在透明基底上的系综纳米结构的消光测量和前所未有的大等离子体位移和灵敏度使得该结果对于开发实用的光学氢传感器非常有希望。
Hydrogen detection is crucial for the safety of all hydrogen-related applications. Compared to electrical hydrogen sensors, which usually suffer from possible electric sparks, optical hydrogen sensors offer advantages of remote and contact-free readout and therefore the avoidance of spark generation. Herein, bimetallic Au/Pd nanostructure monolayers that exhibit ultrasensitive plasmonic response to hydrogen are reported. Bimetallic Au/Pd nanostructures with continuous and discontinuous Pd shells are prepared. The plasmonic response to hydrogen is monitored by measuring the extinction spectra of the ensemble Au/Pd nanostructures deposited on glass slides. Introduction of hydrogen induces red plasmon shifts, which become larger for the nanostructures with thicker Pd shells. For the nanostructures with continuous Pd shell, the plasmon shift can reach 56 nm at the hydrogen volume concentration below the explosion limit. The plasmon resonance wavelength displays an excellent linear dependence on the hydrogen volume concentration below 1%. The detection limit in the experiments reaches 0.2%. The nanostructures with discontinuous Pd shell show smaller plasmon shifts than those with continuous Pd shell. The extinction measurements on the ensemble nanostructures supported on transparent substrates and the unprecedentedly large plasmon shifts and sensitivity make the results very promising for the development of practical optical hydrogen sensors.