TY - JOUR
T1 - Differential scanning calorimeter based on suspended membrane single crystal silicon microhotplate
AU - Lee, Jungchul
AU - Spadaccini, Christopher M.
AU - Mukerjee, Erik V.
AU - King, William P.
N1 - Funding Information:
Manuscript received June 19, 2008; revised August 22, 2008. Current version published December 4, 2008. Portions of this work were performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344 (LLNL-JRNL-404777). Subject Editor K. Najafi.
PY - 2008
Y1 - 2008
N2 - This paper introduces an array of single crystal silicon microhotplates for differential scanning calorimetry. Heat transfer analysis considers the tradeoffs between heating and cooling rate, temperature uniformity, and measurement sensitivity, and determines the optimal design for a suspended membrane microhotplate with full backside release. Additionally, considering the requirements of routine sample loading, the size of the square heater (LH) is 100 or 200 μm, while the size of the backside membrane cavity is 400 μm. In the heater region, two interdigitated serpentine doped silicon resistors were designed such that several operational configurations were possible. The hotplates exhibited very high heating efficiency of 36.7 K/mW with LH = 100 μm and 18.3 K/mW with LH = 200 μm while also having time constants on the order of 1 ms. Paraffin wax was mounted on the sensor, and melting was observed when the heater temperature was 55 °C with a voltage ramp of 0.2 V/s. With 8 V/s, the paraffin sample was completely consumed within 1 ms with 0.317 mJ of thermal energy extracted. Our design achieves a combination of time constant, temperature sensitivity, and heating efficiency that are comparable or superior to previously published microcalorimeters. [2008-0159].
AB - This paper introduces an array of single crystal silicon microhotplates for differential scanning calorimetry. Heat transfer analysis considers the tradeoffs between heating and cooling rate, temperature uniformity, and measurement sensitivity, and determines the optimal design for a suspended membrane microhotplate with full backside release. Additionally, considering the requirements of routine sample loading, the size of the square heater (LH) is 100 or 200 μm, while the size of the backside membrane cavity is 400 μm. In the heater region, two interdigitated serpentine doped silicon resistors were designed such that several operational configurations were possible. The hotplates exhibited very high heating efficiency of 36.7 K/mW with LH = 100 μm and 18.3 K/mW with LH = 200 μm while also having time constants on the order of 1 ms. Paraffin wax was mounted on the sensor, and melting was observed when the heater temperature was 55 °C with a voltage ramp of 0.2 V/s. With 8 V/s, the paraffin sample was completely consumed within 1 ms with 0.317 mJ of thermal energy extracted. Our design achieves a combination of time constant, temperature sensitivity, and heating efficiency that are comparable or superior to previously published microcalorimeters. [2008-0159].
KW - Differential scanning calorimeter (DSC)
KW - Microhotplate
KW - Single crystal silicon
KW - Suspended membrane
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U2 - 10.1109/JMEMS.2008.2006811
DO - 10.1109/JMEMS.2008.2006811
M3 - Article
AN - SCOPUS:57449085908
SN - 1057-7157
VL - 17
SP - 1513
EP - 1525
JO - Journal of Microelectromechanical Systems
JF - Journal of Microelectromechanical Systems
IS - 6
ER -