Key Lab of Inorganic Functional Materials and Devices, CAS
Tunable plasmonics and its application in biosensing
Dr. JianzhenOu (欧建臻)
Traditional plasmonic materials mainly composed of noble metal nanostructures, which has been of great importance in creating high performance biosensors due to its sensitivity to changes in the surrounding medium and the generation of resonantly enhanced nanoscale light fields. However, the fixed and relatively large free charge concentrations in these noble metals result in great damping losses and prohibit its potential implementation in future on-chip plasmonic sensing systems. More importantly, their bio-sensitivities are only limited to the biochemical events which induce significant change of the ambient refractive-index. It is beyond its capability for many others which are mostly charge-transfer-mediated.
Degenerately doped semiconductor are an emerging class of plasmonic materials for which plasmonic features can be controlled by the concentration of dopants in the crystal structure. This unique feature can offer new dimensions for plasmonicbiosensing by allowing charge based detection. However, their operating wavelengths are limited to the range between near-infrared (NIR) and far-infrared (FIR) that is not easily accessible.
Here, we introduce a new class of tunableplasmonic materials based on either sub-stoichiometric or heavily doped two-dimensional (2D) molybdenum oxides. Due to their capabilities for accommodating a large number of vacancies and ions, their plasmonic properties can be tuned across the whole visible spectrum and the near-red end of the NIR region. Furthermore, through the demonstration of a few representative biosensing models, the bio-sensitivities of these materials are impressive as the structural vacancies and inserted dopants are facilely exchanged from the 2D planar host during biochemical events, providing an unprecedented opportunity in developing high performance biosensors.
欧建臻在澳大利亚皇家墨尔本理工大学获得了纳米材料博士（2012年）与电子通信工程一等荣誉学士（2008年）。欧博士现为澳大利亚皇家墨尔本理工大学高级研究员、澳大利亚研究理事会优秀青年研究员、博士生导师，主要研究方向为纳米敏感材料和微纳米传感器制造。他在近五年内共发表了80余篇SCI文章，其中包括Science, Nature Communications, Nature Electronics, Advanced Materials, Nano Letters与ACS Nano等文章；引用数超过3500；H因子为31。欧博士在其研究生涯中获得了维多利亚学者、马尔科姆·摩尔工业奖章、澳洲研究理事会青年研究员发现奖、德国传感器协会创新奖提名以及中国国家优秀自费留学生等奖项。欧博士作为项目主持人主持了五项澳大利亚国家重点项目基金，并作为项目核心成员参与了总额超过2500万澳元的澳大利亚国家重点实验室建设项目。欧博士现拥有5项国际专利，并在科研成果商业转化领域中有着丰富的经验。