期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 185, 期 -, 页码 274-281出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2013.04.098
关键词
Micro-hot-plates; Temperature distribution; Hot-spots
资金
- Italian Institute of Technology (Project Seed - API NANE)
- MIUR (FIRB-Futuro in Ricerca Project Nanogeneratori di ossido di zinco ad altissima efficienza per l'alimentazione di microsistemi impiantabili e di reti wireless di sensori)
We have recently shown that the temperature distribution in micro-hot-plates with perfectly circular geometry can be accurately expressed in terms of modified Bessel functions. However, the geometry of practical micro-hot-plates cannot be perfectly circular due to several issues, including the presence of the electrical contacts; in fact, a typical manifestation of poor circular-symmetry is the occurrence of simply connected hot-spots. Here we systematically investigate all these issues and describe strategies for designing micro-hot-plates without simply connected hot-spots and with an almost circular temperature distribution. FEM simulations consistently confirm that our methodology reduces the temperature deviations from ideal circular symmetry down to levels which are unimportant for most applications (e. g. less than 2.5 degrees C for a micro-hot-plate operating at 800 degrees C). As a result of the excellent circular symmetry, the temperature distribution in the proposed micro-hot-plates, unlike previously reported devices, can be accurately expressed in terms of the modified Bessel functions, which is a key step toward the design of micro-hot-plates with unprecedented temperature uniformity or with desired temperature profiles. (C) 2013 Elsevier B.V. All rights reserved.
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