DataVXACS Materials LettersPaper
journal article·2023-10-02

ZnO@Ti3C2Tx MXene Hybrid Composite-Based Schottky-Barrier-Coated SAW Sensor for Effective Detection of Sub-ppb-Level NH3 at Room Temperature under UV Illumination

Kedhareswara Sairam Pasupuleti, Alphi Maria Thomas, Devthade Vidyasagar, Vempuluru Navakoteswara Rao, Soon-Gil Yoon, Young-Heon Kim, Song-Gang Kim, Moon-Deock Kim

ACS Materials Letters· Volume 5· Issue 10
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Source abstract

Abstract

Smart sensors capable of detecting NH 3 at sub-ppb levels are important for human health in our daily life. Here, we demonstrate a surface acoustic wave (SAW) sensor based on ZnO@MXene hybrid heterostructure for ultrahigh NH 3 gas detection under UV illumination at room temperature (RT). Under UV illumination, the ZnO@MXene SAW sensor not only significantly enhances the frequency response (Δ f ≈ 32.24 kHz/20 ppm) but also effectively improves the selectivity with a low detection limit (89.41 ppb), short response/recovery times (92/104 s), long-term stability, and robust sensitivity under various relative humidity conditions (dark) to NH 3 at RT. These unique NH 3 sensing properties might be attributed to the enriched functional groups, oxygen vacancies, and excellent charge transfer at the Schottky barrier via band bending, which is explained using an energy band theory sensing mechanism. Overall, the current study offers strategic insights for designing light-activated high-performance SAW-based RT NH 3 sensors in safety assurance and environmental monitoring.
Source: openalex_inverted_index · Quality: baseline

Research context

Composites

OpenAlex topics: Gas Sensing Nanomaterials and Sensors · Acoustic Wave Resonator Technologies · MXene and MAX Phase Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Institute of Quantum Systems (IQS), Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea

Department of Materials Science and Engineering, Chungnam National University, Daeduk Science Town, 34134 Daejeon, Republic of Korea

Department of Materials Science and Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu 41566, Republic of Korea

Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy 502285, India

Nano-convergence Technology Division, National Nanofab Center at Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea

Graduate School of Analytical Science and Technology, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea

Department of Information and Communications, Joongbu University, 305 Donghen-ro, Goyang, Kyunggi-do 10279, Republic of Korea

Department of Physics, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea

Funding

National Research Foundation of Korea · Korea Institute for Advancement of Technology

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