Journal
APPLIED SURFACE SCIENCE
Volume 575, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2021.151701
Keywords
Lanthanide; Upconversion nanomaterials; Surface quenching; Water detection; Sensors
Categories
Funding
- Natural Science Foundation of China [62075217, 11874355, 11874354]
- Fundamental Research Funds for the Central Universities , JLU
- Dutch Research Council (NWO) [731.015.206]
- EU H2020-MSCA-ITN-ETN Action program, ISPIC [675743]
- EU H2020-MSCA-RISE Action program, CANCER [777682]
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Water-sensitive detection is important in various fields. This study demonstrates a high level of water sensitivity using a novel nanophosphor, providing a new strategy for nanophosphor-based sensors.
Water-sensitive detection plays a vital role in our society and life, such as the chemical industry, environmental monitoring, and food inspection. In this work water sensitivity as high as 5 ppm (0.0005 vol%) is realized based on a novel upconversion nanophosphor. Different from the popularly employed low-doping strategies, an efficient high-level-doping nanostructure, i.e., NaErF4@NaYF4, is tailored for the desired upconversion emission, resulting in more than one order of magnitude enhancement of the sensitivity compared to the record of the low-doped counterparts. The superiority of this structure is determined to come from the robust interactions between the Er3+ ions and the water molecules adsorbed on the particle surface. This design offers a new strategy of nanophosphor structures for ultrasensitive water sensing and sheds light on further optimization of nanophosphor based sensors.
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