期刊
ACS NANO
卷 8, 期 5, 页码 5199-5207出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn501250e
关键词
nanoscale temperature sensing; dual-core nanoparticle; mesoporous silica nanoparticle; optical temperature measurement; upconversion nanocrystal; superparamagnetic nanocrystal
类别
资金
- U.S. National Institutes of Health [NIH R01 CA133697]
- Department of Defense [HDTRA-1-13-1-0046]
The temperature increase inside mesoporous silica nanoparticles induced by encapsulated smaller superparamagnetic nanocrystals in an oscillating magnetic field is measured using a crystalline optical nanothermometer. The detection mechanism is based on the temperature-dependent intensity ratio of two luminescence bands in the upconversion emission spectrum of NaYF4:Yb3+, Er3+. A facile stepwise phase transfer method is developed to construct a dual-core mesoporous silica nanoparticle that contains both a nanoheater and a nanothermometer in its interior. The magnetically induced heating inside the nanoparticles varies with different experimental conditions, including the magnetic field induction power, the exposure time to the magnetic field, and the magnetic nanocrystal size. The temperature increase of the immediate nanoenvironment around the magnetic nanocrystals is monitored continuously during the magnetic oscillating field exposure. The interior of the nanoparticles becomes much hotter than the macroscopic solution and cools to the temperature of the ambient fluid on a time scale of seconds after the magnetic field is turned off. This continuous absolute temperature detection method offers quantitative insight into the nanoenvironment around magnetic materials and opens a path for optimizing local temperature controls for physical and biomedical applications.
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