1. Speaker : Won Il Park, Ph.D
NBC Seminar
Semiconductor Nanomaterials and Graphene Hybrid Nanoarchitectures for Electronic and Photonic Applications
Speaker : Won Il Park, Ph.D
Hanyang University
Hybrid semiconductor nanostructures include various types of hybrid material systems in which at least one component is based on nanostructured semiconductor materials. One type of a nanostructured semiconductor material is the one-dimensional (1D) form. These 1D materials can be used for efficient transport of electrons and optical excitations and are thus expected to be critical to the function and integration of high performance electronics and photonics. On the other hand, graphene, two-dimensional (2D) layers of carbon atoms, is emerging as a promising family of materials due to its unique properties, including good electrical and thermal conduction, mechanical strength and elasticity, and optical transparency. Recent achievements in large area synthesis using several methods and success in transferring graphene films onto arbitrary substrates demonstrate significant advances toward their implementation in next-generation electronics and optoelectronics. However, compared with other materials, the study on hybridization of materials and processing by using graphene as one componet is still in an early stage, although it can promote the construction of novel three-dimensional (3D) architectures and multi-functionalities. In this talk, I will present a hybrid system that combines 1D semiconductor nanostructures with 2D graphene as emerging building blocks for future electronics and photonics. Constructions of these hybrid structures have been demonstrated mainly using two approaches: (I) growth/fabrication of a 1D nanostructure array on a graphene surface and (II) transfer of freestanding graphene onto a pre-existing 1D nanostructure array. The first type of 1D-2D hybrids can be achieved by growing regular arrays of ZnO nanorods on 2D graphene layers transferred to the transparent and/or flexible substrates. The hybrid nanostructures exhibited the outstanding electrical conductivity, optical transparency, and mechanical flexibility, which, combined with new optical functions inherited from the ZnO nanorods, suggests a wide spectrum of applications. The second type of 1D-2D hybrid can be fabricated by mounting 2D graphene sheets directly
on the top of the nanorods/pillars to develop novel light emitting diodes (LEDs) and sensors.
When: 4:15 PM on Apr. 28 (Thu.)
Where: Engineering Building 1, E104
Contact: Prof. Jang-Ung Park (2533) /
School of Nano-Bioscience & Chemical Engineering
UNIST