کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7138428 | 1461922 | 2012 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Gold nano-particle-based thermal sensors fabricated using microspotting and DEP techniques
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Gold nano-particle-based thermal sensors fabricated using microspotting and DEP techniques Gold nano-particle-based thermal sensors fabricated using microspotting and DEP techniques](/preview/png/7138428.png)
چکیده انگلیسی
We show that pearl chains of gold nano-particles (Au NPs) are formed consistently between microelectrodes by combining microspotting and dielectrophoretic (DEP) techniques. Experimental results on various sized Au particles and DEP parameters, including voltage and frequency, are reported in this paper to explore the critical parameters in controlling the pearl chain formation (PCF) process between microelectrodes. PCF is observed from 10Â kHz to 5Â MHz for 100Â nm diameter Au NPs, and 100Â kHz to 10Â MHz for 10Â nm Au NPs. Variations in formation rate are detected when the applied voltage and particle size varies. At higher voltages, PCF occurs at a higher rate and the formation time decreases. The optimum frequency for Au NPs PCF shifts to a higher frequency region when the particle size decreases. Theoretical analysis is carried out by calculating the DEP force with AC electrokinetics to explain the observations at DEP frequencies ranging from 10Â Hz to 10Â MHz. Finally, Au NP chains formed between the microelectrodes are shown to vary in resistance consistent with predictions for a simplified model of an impinging jet system, indicating that these Au particle sensors could potentially be used to precisely measure localized temperatures and other localized thermal phenomena.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sensors and Actuators A: Physical - Volume 178, May 2012, Pages 32-39
Journal: Sensors and Actuators A: Physical - Volume 178, May 2012, Pages 32-39
نویسندگان
Siu Ling Leung, Minglin Li, Wen J. Li, John D. Mai,