期刊
ACS APPLIED NANO MATERIALS
卷 5, 期 8, 页码 11997-12005出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.2c03141
关键词
MXene; gas sensor; high sensitivity; ionic additive; alkalization
资金
- National Research Foundation of Korea (NRF) - Ministry of Science and ICT (MSIT) [2021R1C1C1006385, 2021M3H4A1A03047327]
- National Research Council of Science & Technology (NST) by Korea government (MSIT)
- Technology Innovation Program (Ministry of Trade, Industry & Energy (MOTIE, Korea) [00144157]
- Ministry of Trade, Industry & Energy (MOTIE, Korea)
- KIST internal research programs - Korea Institute of Science and Technology (KIST)
- Korea Evaluation Institute of Industrial Technology (KEIT) [00144157] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2021R1C1C1006385] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study presents an efficient method to enhance the gas-sensing performance of MXene sensors by adding alkaline ionic additives, resulting in increased density of surface functional groups and intercalated metal ions. The Ti3C2Tx mixed with potassium hydroxide showed significantly higher sensitivity towards ethanol vapor and achieved one of the highest signal-to-noise ratios ever reported for ammonia gas.
MXene nanomaterials have shown outstanding gas-sensing performance at room temperature because of their electrical conductivity and high-density surface functional groups. The sensing properties of MXenes are largely governed by surface adsorption and interlayer diffusion. In light of this sensing mechanism, surface alkalization and ion intercalation have been shown to enhance the gas-sensing performance of MXenes. However, a simple and reliable method for realizing this is still lacking. Here, we present an efficient method to enhance the sensing performance of Ti3C2Tx MXene sensors while retaining their native uniform laminate structure. We show that by adding a controlled amount of alkaline ionic additives, the density of hydroxyl surface groups and intercalated metal ions can be increased inside the thin film structure, which cannot be achieved using acidic or neutral ionic additives with similar elemental compositions. In terms of a signal-to-noise ratio (SNR), Ti3C2Tx mixed with potassium hydroxide was 20 times more sensitive than pristine Ti3C2Tx toward ethanol vapor, thus demonstrating its high sensitivity. In addition, a very high SNR of 700 was achieved toward 100 ppm ammonia gas, which is one of the highest ever reported.
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