Title: Schottky contact optimization for metal/2D material interface for plasmonics enhanced heavy metal ion sensor in drinking water

Abstract:

2D nanomaterials become one of the most promising materials for sensing applications due to the ultrathin planar structure. Such ultrathin structure involves the electrons/holes are confined to a plane of atomic thickness makes two-dimensional nanomaterials sensitive (fast response) to the surrounding environment which can be fast changes in optical, electronic, and other properties or parameters in the 2D nanomaterials. However, 2D nanomaterials-based sensor has been suffering from high resistance and low sensitivity due to the loss caused by poor contact between the 2D nanomaterial and interface. In this work, different type of metal contact is needed for different chemically functionalized the 2D nanomaterial used for heavy metal sensing. The ultimate performance of the sensor can be optimized by minimize the low Schottky barrier (SB) height between the metal/2D nanomaterial using Transmission Line Measurement (TLM) process.

One of the most fundamental problems for the contact interface is that 2D nanomaterials cannot be doped easily. A high different in doping level between the interface of 2D nanomaterials and metal resulted in a high contact resistance lead to lower efficiency.  Various techniques have been investigated and are reviewed to lower the contact resistance.

Biography:

Rozalina Zakaria received her B. Sc (Hons.) in Physics in 2000, Master in Applied Physics from University of Malaya in 2002 and later a PhD degree in Laser Physics in 2009 from University of Hull, United Kingdom. She has been involving in teaching many subjects namely; Fundamentals of Matter, Experimental Methods, Optics, Thermal Properties of Materials, Photonics Materials and Devices and Photonics and Optoelectronics. She joined Physics Department after her PhD before transferred to Photonics Research Centre since 2015. Her research interest includes fundamental and applied aspects of fundamental nanophotonics such as optical fiber sensors and solar cell. Her career is spanning over than 7 years which has resulted in the graduation of 3 PhD students and 5 Master students. She is now supervising 4 PhD’s students.