Photothermal behaviour of titanium nitride nanoparticles evaluated by transient X-ray diffraction
Photothermal behaviour of titanium nitride nanoparticles evaluated by transient X-ray diffraction
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DOI：
10.1039/d0nr08202c
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发表时间：
2021-01-28
期刊：
影响因子：
6.7
通讯作者：
Schaller, Richard D.
中科院分区：
文献类型：
--
作者：
Diroll, Benjamin T.;Brumberg, Alexandra;Schaller, Richard D.
金属氮化物的光热性能在太阳能转换、光热治疗、光反应和热致变色窗等领域有着广泛的应用，近年来受到了人们的广泛关注。在这里，使用瞬态X射线衍射检查氮化钛纳米颗粒的光热响应，其中光激发与X射线脉冲同步，以表征TiN晶格的动态变化。光致衍射数据进行定量分析，以确定增加的TiN晶格间距，这是进一步校准对静态的，温度依赖的衍射图案相同的样品。20 nm和50 nm直径的TiN纳米粒子的测量揭示了瞬态晶格加热从室温到类似于175摄氏度的最高泵注量在这里调查。增加激发强度驱动晶格温度的次线性增加，这是由于在较高功率下实现的较高有效温度下的热容增加。时间动力学表明，更高的激发强度不仅驱动更高的晶格温度，而且出乎意料地更慢的冷却的TiN纳米颗粒，这是由于加热的溶剂接近纳米颗粒表面。
The photothermal properties of metal nitrides have recently received significant attention owing to diverse applications in solar energy conversion, photothermal therapies, photoreactions, and thermochromic windows. Here, the photothermal response of titanium nitride nanoparticles is examined using transient X-ray diffraction, in which optical excitation is synchronized with X-ray pulses to characterize dynamic changes in the TiN lattice. Photoinduced diffraction data is quantitatively analyzed to determine increases in the TiN lattice spacing, which are furthermore calibrated against static, temperature-dependent diffraction patterns of the same samples. Measurements of 20 nm and 50 nm diameter TiN nanoparticles reveal transient lattice heating from room temperature up to similar to 175 degrees C for the highest pump fluences investigated here. Increasing excitation intensity drives sublinear increases in lattice temperature, due to increased heat capacity at the higher effective temperatures achieved at higher powers. Temporal dynamics show that higher excitation intensity drives not only higher lattice temperatures, but also unexpectedly slower cooling of the TiN nanoparticles, which is attributed to heating of the solvent proximal to the nanoparticle surface.