한양대학교 · Engineering
김현우 교수의 연구실은 저소비 전력 및 실온에서 작동하는 고감도 기반의 나노소재 기반 기체 센서 개발에 초점을 맞추고 있습니다. 주로 그래핀, ZnO 나노와이어, SnO₂ 등 반도체 산화물 나노구조물을 활용해 선택성과 민감도를 향상시킨 센서를 설계하고 있으며, 마이크로파 처리 및 도핑 기법을 통해 물리화학적 특성을 정밀하게 제어합니다. 특히 유연성과 내구성을 갖춘 센서 소자 개발을 통해 실생활 적용 가능성을 높이고 있습니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
Nitrogen (N)-doped graphene with different atomic percentages (2.3–4.7 at%) of N has been synthesized by thermal annealing of reduced graphene oxide (RGO) in ammonia gas for different times. The effects of annealing time on the structure, electrical and optical properties of N-doped graphene have been systematically investigated by using various analytical techniques. XPS, FTIR, Raman, and XRD studies show that there is a gradual structural change in N-doped graphene sheets with increasing annea
We obtained extremely high and selective sensitivity to NO<sub>2</sub> gas by fabricating graphene-SnO<sub>2</sub> nanocomposites using a commercial microwave oven. Structural characterization revealed that the products corresponded to agglomerated structures of graphene and SnO<sub>2</sub> particles, with small secondary SnO<sub>x</sub> (x ≤ 2) nanoparticles deposited on the surfaces. The overall oxygen atomic ratio was decreased with the appearance of an SnO<sub>x</sub> (x < 2) phase. By the m
Herein, we report the synthesis of pristine and Au-functionalized ZnO nanowires (NWs) for low power consumption (self-heated) gas sensors at room temperature. The ZnO NWs were produced via a vapor-liquid-solid growth technique, and Au layers with different thicknesses were sputter-deposited on the ZnO NWs, followed by subsequent annealing. Microscopic characterization methods demonstrated that ZnO NWs were successfully formed. Pristine ZnO NW gas sensors showed the best sensitivity toward either
ConspectusGas sensors are used in various applications to sense toxic gases, mainly for enhanced safety. Resistive sensors are particularly popular owing to their ability to detect trace amounts of gases, high stability, fast response times, and affordability. Semiconducting metal oxides are commonly employed in the fabrication of resistive gas sensors. However, these sensors often require high working temperatures, bringing about increased energy consumption and reduced selectivity. Furthermore
