کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
742943 894332 2010 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Innovative design for optical porous silicon gas sensor
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Innovative design for optical porous silicon gas sensor
چکیده انگلیسی

A simple system for the detection of analytes in the atmosphere employing a freestanding nanostructured porous silicon optical microcavity was designed and built. The system is based on the measurement of optical transmittance changes as a function of the incidence angle of a monochromatic laser beam. Using a matrix formalism and effective medium theories we calculate the optimal conditions for the system so as to obtain the best sensitivity of the sensor. We tested the system over a detection area of the porous silicon microcavity of 100 μm2 with isopropyl alcohol vapor diluted in a N2 stream. With the system proposed we were able to detect changes in the concentration of isopropyl alcohol as small as 1 ppm, which is equivalent to a change in the effective refractive index of about 3 × 10−6. The response time is very fast, lower than 0.5 s.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sensors and Actuators B: Chemical - Volume 149, Issue 1, 6 August 2010, Pages 189–193
نویسندگان
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