Mai Hien Duy, Jeong Sangmin, Nguyen Tri Khoa, Youn Jong-Sang, Ahn Seungbae, Park Cheol-Min, Jeon Ki-Joon
Department of Environmental Engineering, Inha University, 100 Inha-ro, Nam-gu, Incheon 22212, Republic of Korea.
Department of Environmental Engineering, The Catholic University of Korea, Bucheon 14662, Republic of Korea.
ACS Appl Mater Interfaces. 2021 Mar 31;13(12):14644-14652. doi: 10.1021/acsami.0c20475. Epub 2021 Mar 16.
Developing sensing approaches that can exploit visible light for the detection of low-concentration hydrogen at room temperatures has become increasingly important for the safe use of hydrogen in many applications. In this study, heterostructures composed of monolayer MoS and Pd nanoclusters (Pd/MoS) acting as photo- and hydrogen-sensitizers are successfully fabricated in a facile and scalable manner. The uniform deposition of morphologically isotropic Pd nanoclusters (11.5 ± 2.2 nm) on monolayer MoS produces a plethora of active heterojunctions, effectively suppressing charge carrier recombination under light illumination. The dual photo- and hydrogen-sensitizing functionality of Pd/MoS can enable its use as an active sensing layer in optoelectronic hydrogen sensors. Gas-sensing examinations reveal that the sensing performance of Pd/MoS is enhanced three-fold under visible light illumination (17% for 140 ppm of H) in comparison with dark light (5% for 140 ppm of H). Photoactivation is also found to enable excellent sensing reversibility and reproducibility in the obtained sensor. As a proof-of-concept, the integration of Pd nanoclusters and monolayer MoS can open a new avenue for light-induced hydrogen gas sensing at room temperature.
开发能够利用可见光在室温下检测低浓度氢气的传感方法，对于氢气在许多应用中的安全使用变得越来越重要。在本研究中，成功地以简便且可扩展的方式制备了由单层MoS和Pd纳米团簇（Pd/MoS）组成的异质结构，它们作为光和氢敏化剂。形态各向同性的Pd纳米团簇（11.5±2.2 nm）在单层MoS上的均匀沉积产生了大量的活性异质结，有效地抑制了光照下的电荷载流子复合。Pd/MoS的双光和氢敏化功能使其能够用作光电氢传感器中的活性传感层。气敏测试表明，与暗光（140 ppm氢气时为5%）相比，在可见光照射下（140 ppm氢气时为17%），Pd/MoS的传感性能提高了三倍。还发现光激活能够使所制备的传感器具有出色的传感可逆性和可重复性。作为概念验证，Pd纳米团簇与单层MoS的集成可为室温下光致氢气传感开辟一条新途径。
