Department of Chemical and Biomolecular Engineering
Korea Advanced Institute of Science and Technology

Recent Achievements

제목

[Front cover picture] Metallic Ti3C2Tx MXene Gas Sensors with Ultrahigh Signal-to-Noise Ratio

Title: Metallic Ti3C2Tx MXene Gas Sensors with Ultrahigh Signal-to-Noise Ratio

Author: Seon Joon Kim, Hyeong-Jun Koh, Chang E. Ren, Ohmin Kwon, Kathleen Maleski, Soo-Yeon Cho, Babak Anasori, Choong-Ki Kim, Yang-Kyu Choi, Jihan Kim, Yury Gogotsi*, Hee-Tae Jung*


Journal: ACS Nano 2018, 12 (2), 986-993.


Abstract: Achieving high sensitivity in solid-state gas sensors can allow the precise detection of chemical agents. In particular, detection of volatile organic compounds (VOCs) at the parts per billion (ppb) level is critical for the early diagnosis of diseases. To obtain high sensitivity, two requirements need to be simultaneously satisfied: (i) low electrical noise and (ii) strong signal, which existing sensor materials cannot meet. Here, we demonstrate that 2D metal carbide MXenes, which possess high metallic conductivity for low noise and a fully functionalized surface for a strong signal, greatly outperform the sensitivity of conventional semiconductor channel materials. Ti3C2Tx MXene gas sensors exhibited a very low limit of detection of 50100 ppb for VOC gases at room temperature. Also, the extremely low noise led to a signal-to-noise ratio 2 orders of magnitude higher than that of other 2D materials, surpassing the best sensors known. Our results provide insight in utilizing highly functionalized metallic sensing channels for developing highly sensitive sensors. 

 

 

 

0

추천하기

0

반대하기

첨부파일 다운로드

등록자관리자

등록일2018-03-06

조회수3,046

  • 페이스북 공유
  • 트위터 공유
  • Google+ 공유
  • 인쇄하기
 
스팸방지코드 :
사진제목
Tuning selectivity of electrochemical reactions by atoomically dispersed platinum catalyst Chang Hyuck Choi, Minho Kim, Han Chang Kwon, Sung June Cho, Seongho Yun, Hee-Tak Kim, Karl J.J. Mayrhofer, Hyungjun Kim, Minkee Choi Nature Communications, Vol. 7, page 10922 (March 8, 2016) [Abstract] Maximum atom efficiency as well as distinct chemoselectivity is expected for electrocat...
Sustainable Redox Mediation for Lithium–Oxygen Batteries by a Composite Protective Layer on the Lithium-Metal Anode   Dong Jin Lee†, Hongkyung Lee†, Yun-Jung Kim , Jung-Ki Park ,* and Hee-Tak Kim* († denotes equal contribution)   Advanced Materials, Vol. 28, Issue 5, page 857-863 (February 3, 2016) [Abstract]A synergic combination of a soluble &sh...
Liquid-Impermeable Inverse Opals with Invariant Photonic Bandgap (pages 1282–1287) Hyelim Kang, Joon-Seok Lee, Won Seok Chang and Shin-Hyun Kim Article first published online: 10 DEC 2014 | DOI: 10.1002/adma.201404706 [ABSTRACT] Omniphobic inverse opals are created by structurally and chemically modifying the surface of inverse opals through reactive ion etching. During the etching, ...
Robust Microfluidic Encapsulation of Cholesteric Liquid Crystals toward Photonic Ink Capsules,` Advanced Materials, 27, 627−633 (2015) Sang Seok Lee, Bomi Kim, Su Kyung Kim, Jong Chan Won, Yun Ho Kim, and Shin-Hyun Kim 관련기사:  http://www.hellodd.com/news/article.html?no=51837  [ABSTACT] Robust photonic microcapsules are created by microfluidic encapsulation of chol...
Cofactor-Free Light-Driven Whole-Cell Cytochrome P450 Catalysis Angew. Chem. Int. Ed. 54(3):969-973 (Jan. 12 2015)   Park JH, Lee SH, Cha GS, Choi DS, Nam DH, Lee JH, Lee JK, Yun CH, Jeong KJ*, Park, CB*  [ABSTRACT] Cytochromes P450 can catalyze various regioselective and stereospecific oxidation reactions of non-functionalized hydrocarbons. Here, we have designed a novel ...