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Fluctuations of the number of adsorbed molecules due to adsorption–desorption processes coupled with mass transfer and surface diffusion in bio/chemical MEMS sensors

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2014
10.1016@j.mee.2014.06.001.pdf (830.4Kb)
Authors
Đurić, Zoran G.
Jokić, Ivana
Peleš, Adriana
Article (Accepted Version)
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Abstract
In this study we have developed, for the first time, the comprehensive theoretical model of the fluctuations of the number of adsorbed molecules in MEMS chemical and biological sensors, taking into account the processes of mass transfer, adsorption and desorption, and surface diffusion of adsorbed molecules. It is observed that the shape of the fluctuations spectrum contains information about various parameters of the adsorbed analyte and that even the analytes with the same affinity for the same binding sites have different spectra. The numerical calculations performed using the derived theory show that the influence of surface diffusion on the fluctuations spectrum can be significant. The practical value of this work stems from the fact that the fluctuations of the number of adsorbed molecules can be a dominant noise component in affinity-based bio/chemical sensors. Therefore, the derived theory is useful for development of the methods for the detection of analytes based on frequency... domain analysis of the measured fluctuations. The recognition of an adsorbed analyte using sensors with non-functionalized sensing surface will also be considered using the presented theory.

Keywords:
chemical sensors / biosensors / adsorption–desorption / mass transfer / surface diffusion
Source:
Microelectronic Engineering, 2014, 124, 81-85
Publisher:
  • Elsevier
Projects:
  • Directed synthesis, structure and properties of multifunctional materials (RS-172057)
  • Micro- Nanosystems and Sensors for Electric Power and Process Industry and Environmental Protection (RS-32008)
  • Serbian Academy of Sciences and Arts, Project F-150
Note:
  • Poster: http://dais.sanu.ac.rs/handle/123456789/552
  • This is the peer-reviewed version of the article: Djurić, Z., Jokić, I., Peleš, A., 2014. Fluctuations of the number of adsorbed molecules due to adsorption–desorption processes coupled with mass transfer and surface diffusion in bio/chemical MEMS sensors. Microelectronic Engineering, Micro/Nano Biotechnologies and Systems 2013 124, 81–85. https://doi.org/10.1016/j.mee.2014.06.001

DOI: 10.1016/j.mee.2014.06.001

ISSN: 0167-9317

WoS: 000344825100016

Scopus: 2-s2.0-84903139520
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URI
http://dais.sanu.ac.rs/123456789/4727
http://cer.ihtm.bg.ac.rs/handle/123456789/2604
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