4.7 Article

Partial Exchange between Inorganic and Organic Anions in MgAl Layered Double Hydroxide Nanosheets for Humidity Sensing

期刊

ACS APPLIED NANO MATERIALS
卷 5, 期 4, 页码 4991-4997

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsanm.1c04577

关键词

organic species intercalation; anion exchange; hydroxyl ion conduction; humidity sensor; human breath monitor

资金

  1. National Key Basic Research Program of China [2021YFB3200302]
  2. National Natural Science Foundation of China [51832001]
  3. Fundamental Research Funds for the Central Universities of China
  4. Joint Research Funds of Department of Science & Technology of Shaanxi Province [2020GXLH-Z-026, 2020GXLH-Z-027]
  5. Northwestern Polytechnical University [2020GXLH-Z-026, 2020GXLH-Z-027]

向作者/读者索取更多资源

Moderate BDC intercalation can significantly improve the humidity sensing response of LDHs, while high BDC concentration leads to reduced ionic conduction.
Layered double hydroxides (LDHs) are a class of layered materials that show intercalant-dependent properties. Precise control over the type and concentration of intercalants in LDHs is important to tailor their properties and functions. Herein, through an anion exchange process, we partially replaced the NO32- ions in MgAl-LDH nanosheets with terephthalic acid (BDC) ions and systematically studied their ionic conduction and humidity sensing properties at different NO32-/BDC ratios. Our results show that moderate BDC intercalation boosted the humid sensing response to 3 orders of magnitude compared to the original MgAl-LDH intercalated with NO32- ions. This is because the BDC molecules could help improve the hydrophilicity of the LDH and thus the ability to absorb water molecules. However, too high a BDC concentration resulted in a considerable reduction in the ionic conduction of the LDH because this might block ionic conductive paths. As a demonstration, the MgAl-LDH-NO32--BDC hybrid was fabricated into a flexible humidity sensor, which showed potential as a wearable breath sensor.

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