Yuan Ye, Gao Changyong, Wang Daolin, Zhou Chang, Zhu Baohua, He Qiang
Chemistry and Chemical Engineering College, Inner Mongolia University, College Road 235, Hohhot 010021, China.
Key Laboratory of Microsystems and Microstructures Manufacturing, Ministry of Education, Harbin Institute of Technology, Yi Kuang Jie 2, Harbin 150080, China.
Beilstein J Nanotechnol. 2019 Jun 28;10:1324-1331. doi: 10.3762/bjnano.10.131. eCollection 2019.
An active TNT (2,4,6-trinitrotoluene) catalytic sensor based on Janus upconverting nanoparticle (UCNP)-functionalized micromotor capsules, displaying "on-off" luminescence with a low limit of detection has been developed. The Janus capsule motors were fabricated by layer-by-layer assembly of UCNP-functionalized polyelectrolyte microcapsules, followed by sputtering of a platinum layer onto one half of the capsule. By catalytic decomposition of hydrogen peroxide to oxygen bubbles, the Janus UCNP capsule motors are rapidly propelled with a speed of up to 110 μm s. Moreover, the Janus motors display efficient on-off luminescent detection of TNT. Owing to the unique motion of the Janus motor with bubble generation, the likelihood of collision with TNT molecules and the reaction rate between them are increased, resulting in a limit of detection as low as 2.4 ng mL TNT within 1 minute. Such bubble-propelled Janus UCNP capsule motors have great potential for contaminated water analysis.
基于Janus上转换纳米颗粒（UCNP）功能化微电机胶囊的活性三硝基甲苯（TNT）催化传感器已被开发出来，该传感器具有“开-关”发光特性且检测限低。Janus胶囊电机是通过逐层组装UCNP功能化的聚电解质微胶囊，然后在胶囊的一半表面溅射铂层制成的。通过将过氧化氢催化分解为氧气泡，Janus UCNP胶囊电机以高达110μm/s的速度快速推进。此外，Janus电机对TNT显示出高效的开-关发光检测。由于Janus电机产生气泡的独特运动，增加了与TNT分子碰撞的可能性以及它们之间的反应速率，从而在1分钟内实现低至2.4 ng/mL TNT的检测限。这种气泡驱动的Janus UCNP胶囊电机在污水分析方面具有巨大潜力。
