| 학회 | 한국재료학회 |
| 학술대회 | 2018년 봄 (05/16 ~ 05/18, 삼척 쏠비치 호텔&리조트) |
| 권호 | 24권 1호 |
| 발표분야 | E. 환경/센서 재료 분과 |
| 제목 | Self-sustainable chemical sensors based on 2D semiconductor heterostructures |
| 초록 | Two-dimensional (2D) materials including semiconducting transition metal dichalcogenides (TMDCs) and semi-metallic graphene have attracted tremendous interests as emerging materials for sensing various chemical and biological substances. Owing to the atomic thickness and consequent large surface-to-volume ratio of those layered materials, they can offer a promising platform for the development of highly sensitive sensors with low power consumption, particularly in the form of chemiresistive field-effect transistors. In addition, combined with ability to build various 2D heterostructures with atomically sharp interfaces, it is possible to develop a novel sensing platform that can have enhanced sensitivity and less power consumption. In this research, we report on the fabrication of two types of 2D heterostructured devices and their gas sensing characteristics. The devices including graphene/Si heterojunctions and graphene/TMDCs/graphene heterostructures were fabricated by the polymer-assisted wet transfer of graphene and TMDCs. The devices exhibited excellent sensing behaviors to various gases including hydrogen (H2), nitrogen dioxide (NO2) and ammonia (NH3) because the junction barriers between graphene and underlying semiconductors are sensitively modulated depending on the presence of gas molecules. In addition, particularly for H2, we have achieved high selectivity by decorating palladium as a catalyst on the surface of the devices. Furthermore, we have demonstrated that these photoresponsive devices can be operated as a sensor without external electrical power under uniform light illumination. |
| 저자 | YoonSeok Kim1, Haeli Park1, Donghun Lee1, Soodeok Han1, Suhan Kim2, Jaeyoon Lee3, Woong Huh1, Myungjin Park1, Wonil Park1, Chongyun Kang3, Chulho Lee2 |
| 소속 | 1고려대, 2KIST, 3한양대 |
| 키워드 | Self-sustainable; Chemical sensor; 2D materials; Transition Metal Dichalcogenides; 2D Heterostructures |
