Simon Chung, Vedran Vonk, David Pennicard, Heinz Graafsma, Andreas Stierle
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引用次数: 0
摘要
通过 X 射线衍射研究了由氧化镁基底支撑的钯纳米粒子群的脉冲激光加热。通过热晶格膨胀引起的时间分辨布拉格峰移测量,确定了钯纳米粒子的瞬态温度,该温度在激光激发后迅速上升至少 100 K,然后在 90 ns 内衰减。衍射实验使用连续辐射的铜 x 射线管和混合像素检测器 Timepix3 进行,Timepix3 在到达时间模式下进行单光子计数。这种检测方案不需要对泵-探针延迟进行耗时的扫描。实验时间分辨率估计为 15 ± 5 ns,非常接近探测器的极限,与 7 ns 的激光脉冲持续时间相匹配。与块状金属单晶相比,钯纳米粒子达到的最高温度更高,冷却速度更低。这些影响的原因是氧化物支架具有较低的热传导率。
Transient heating of Pd nanoparticles studied by x-ray diffraction with time of arrival photon detection
Pulsed laser heating of an ensemble of Pd nanoparticles, supported by a MgO substrate, is studied by x-ray diffraction. By time-resolved Bragg peak shift measurements due to thermal lattice expansion, the transient temperature of the Pd nanoparticles is determined, which quickly rises by at least 100 K upon laser excitation and then decays within 90 ns. The diffraction experiments were carried out using a Cu x-ray tube, giving continuous radiation, and the hybrid pixel detector Timepix3 operating with single photon counting in a time-of-arrival mode. This type of detection scheme does not require time-consuming scanning of the pump-probe delay. The experimental time resolution is estimated at 15 ± 5 ns, which is very close to the detector's limit and matches with the 7 ns laser pulse duration. Compared to bulk metal single crystals, it is discussed that the maximum temperature reached by the Pd nanoparticles is higher and their cooling rate is lower. These effects are explained by the oxide support having a lower heat conductivity.