Synthesis of nano-structured materials by laser-ablation and their application to sensors
Synthesis of nano-structured materials by laser-ablation and their application to sensors
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DOI：
10.1016/j.apsusc.2007.02.152
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发表时间：
2007-07
影响因子：
6.7
通讯作者：
T. Okada;J. Suehiro
中科院分区：
文献类型：
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作者：
T. Okada;J. Suehiro
我们描述了通过激光烧蚀合成 ZnO 和 Pd 纳米结构材料及其在传感器中的应用。 ZnO 纳米线的合成是通过纳米颗粒辅助沉积 (NPAD) 进行的，其中纳米晶体是通过在 Ar 背景气体中激光烧蚀 ZnO 烧结靶而产生的纳米颗粒来生长的。用扫描电子显微镜对合成的 ZnO 纳米线进行了表征，并在 Nd:YAG 激光三次谐波的激发下检查了光致发光特性。通过激光吹气技术和/或超声处理，将直径在50至150nm范围内、长度长达5μm的纳米线从基底中取出。经证实，纳米线在光泵浦下表现出受激发射，表明具有高质量的结晶度。钯纳米粒子是通过在纯水中激光烧蚀钯板而产生的。透射电子显微镜观察发现，生成了直径在3nm至几十纳米范围内的Pd纳米颗粒。利用这些纳米结构材料，我们通过介电泳技术成功地制造了传感器。在紫外光传感器的情况下，实现了10nW/cm2的检测灵敏度，在氢传感的情况下，Pd纳米颗粒的响应时间已被证明小于10秒。
We describe the synthesis of nano-structured materials of ZnO and Pd by laser ablation and their applications to sensors. The synthesis of ZnO nano-wires was performed by nano-particle assisted deposition (NPAD) where nano-crystals were grown with nano-particles generated by laser-ablating a ZnO sintered target in an Ar background gas. The synthesized ZnO nano-wires were characterized with a scanning electron microscopy and the photoluminescent characteristics were examined under an excitation with the third harmonics of a Nd:YAG laser. The nano-wires with a diameter in the range from 50 to 150nm and a length of up to 5μm were taken out of the substrate by laser blow-off technique and/or sonication. It was confirmed that the nano-wires showed the stimulated emission under optical pumping, indicating a high quality of the crystalinity. Pd nano-particles were generated by laser-ablating a Pd plate in pure water. The transmission electron microscope observation revealed that Pd nano-particles with a diameter in the range from 3nm to several tens of nanometers were produced. Using these nano-structured materials, we successfully fabricated sensors by the dielectrophoresis techniques. In the case of the ultraviolet photosensor, a detection sensitivity of 10nW/cm2was achieved and in the case of hydrogen sensing, the response time of less than 10s has been demonstrated with Pd nano-particles.