HIGH-SPEED (10(4)-DEGREES-C/S) SCANNING MICROCALORIMETRY WITH MONOLAYER SENSITIVITY (J/M(2))
HIGH-SPEED (10(4)-DEGREES-C/S) SCANNING MICROCALORIMETRY WITH MONOLAYER SENSITIVITY (J/M(2))
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DOI：
10.1063/1.115016
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发表时间：
1995-08-28
影响因子：
4
通讯作者：
MA, Z
中科院分区：
文献类型：
--
作者：
LAI, SL;RAMANATH, G;MA, Z
我们推出了一种高灵敏度 (1J/m(2)) 扫描微量热计，可在高加热速率 (10(4) 摄氏度/秒）下使用。该系统采用超薄氮化硅膜设计，用作热量计的低热质量机械支撑结构。该系统的量热测量是通过应用于薄膜镍加热元件（也用作温度计）的电阻加热技术来完成的。通过镍加热器的电流脉冲通过焦耳热在样品中产生热量。测量加热器的电压和电流特性，以获得输送到系统的温度和热量的实时值。该技术显示了测量界面和表面过程的不可逆反应热的潜力。该方法通过测量 50 至 1000 埃不同量的热蒸发锡的熔化热来证明。 (C) 1995 年美国物理研究所。
We introduce a high sensitivity (1J/m(2)) scanning microcalorimeter that can be used at high heating rates (10(4) degrees C/s). The system is designed using ultrathin SiN membranes that serve as a low thermal mass mechanical support structure for the calorimeter. Calorimetry measurements of the system are accomplished via resistive heating techniques applied to a thin film Ni heating element that also serves as a thermometer. A current pulse through the Ni heater generates heat in the sample via Joule heating. The voltage and current characteristics of the heater were measured to obtain real-time values of the temperature and the heat delivered to the system. This technique shows potential for measuring irreversible heat of reactions for processes at interfaces and surfaces. The method is demonstrated by measuring the heat of fusion for various amounts of thermally evaporated Sn ranging from 50 to 1000 Angstrom. (C) 1995 American Institute of Physics.