Pt-Functionalized PdO Nanowires for Room Temperature Hydrogen Gas Sensors
Pt-Functionalized PdO Nanowires for Room Temperature Hydrogen Gas Sensors
复制标题
DOI：
10.1021/acssensors.8b00714
复制
发表时间：
2018-10-01
期刊：
影响因子：
8.9
通讯作者：
Kim, Il-Doo
中科院分区：
文献类型：
--
作者：
Cho, Hee-Jin;Chen, Vivian T.;Kim, Il-Doo
在这项工作中，我们使用光刻图案化Pd纳米线电沉积(LPNE)方法制备了排列良好的PdO纳米线(PdNW)阵列，然后在500℃下进行随后的焙烧。通过在PdO纳米线上通过简单的还原过程将铂纳米颗粒(NPs)敏化，显著提高了载铂Pd纳米线(Pt-PDO NWS)传感器对室温下氢气(H-2)的检测能力。分布均匀的铂纳米粒子是已知的化学增敏剂，通过溢出效应激活了H-2和氧分子的解离，随后这些产物扩散到PdO表面，从而将整个PDO NWS表面转化为H-2的反应中心。结果表明，在高浓度H-2(0.2%)下，铂-PDO纳米粒子的灵敏度提高了62%(定义为Delta R/R-AIR X 100%)，而原始PDO纳米粒子的灵敏度(6.1%)有所提高。PtPdO NWS的响应时间为166S，是原始PdO NWS(445S)的2.68倍。此外，与原始的PDO NWS不同的是，铂-PdO NWS对非常低浓度的H-2(10ppm)的灵敏度为14%，在该浓度下没有任何反应。这些突出的结果主要归功于铂纳米颗粒在排列良好的PdO纳米颗粒表面的均匀修饰。在这项工作中，我们证明了在室温下，铂-PDO纳米WS作为高灵敏H-2敏感层的潜在适宜性。
In this work, we prepared a well-aligned palladium oxide nanowire (PdO NW) array using the lithographically patterned Pd nanowire electrodeposition (LPNE) method followed by subsequent calcination at 500 degrees C. Sensitization with platinum (Pt) nanoparticles (NPs), which were functionalized on PdO NWs through a simple reduction process, significantly enhanced the detection capability of the Pt-loaded PdO NWs (Pt-PdO NWs) sensors toward hydrogen gas (H-2) at room temperature. The well-distributed Pt NPs, which are known chemical sensitizers, activated the dissociation of H-2 and oxygen molecules through the spillover effect with subsequent diffusion of these products to the PdO surface, thereby transforming the entire surface of the PdO NWs into reaction sites for H-2. As a result, at a high concentration of H-2 (0.2%), the Pt-PdO NWs showed an enhanced sensitivity of 62% (defined as Delta R/R-air X 100%) compared to that (6.1%) of pristine PdO NWs. The Pt-PdO NWs exhibited a response time of 166 s, which was 2.68-fold faster than that of pristine PdO NWs (445 s). In addition, the Pt-PdO NWs responded to a very low concentration of H-2 (10 ppm) with a sensitivity of 14%, unlike the pristine PdO NWs, which did not exhibit any response at that concentration. These outstanding results are mainly attributed to a homogeneous decoration of Pt NPs on the surface of well-aligned PdO NWs. In this work, we demonstrated the potential suitability of Pt-PdO NWs as a highly sensitive H-2 sensing layer at room temperature.