Selective acetone electrical detection using functionalized nano-porous silicon
01 Dec 2015-pp 1-4
TL;DR: In this article, a functionalized nano-porous silicon (PS) was used for detecting acetone in the presence of volatile organic compounds (VOCs) and moisture.
Abstract: This paper reports selective acetone sensing portrayed by functionalized nano-porous silicon (PS). Functionalization of nanostructure was performed using hexamethyldisilazane (HMDS). Nano-PS fabrication and morphology analysis were done using electrochemical etching and SEM respectively. Optical properties of PS were analyzed using Raman and Photoluminescence (PL) spectroscopy. Parallel aluminium electrodes were formed on nano-PS surface using thermal evaporation technique. These electrodes were used for recording electrical measurements from porous surface in presence of volatile organic compounds (VOCs) and moisture. Resistance variations due to interaction of sensing surface with different concentrations of ethanol, acetone, moisture and isopropyl alcohol vapors were monitored at room temperature. Various sensor parameters were calculated like sensitivity, response- and recovery-time. Sensor based on functionalized nano-PS was found to be most responsive for acetone in comparison to other VOCs or moisture. Since, acetone is one of the important metabolite components in the circulated blood of the human body therefore, its concentration determination is necessary. The approach for selective sensing presented in this work is simple and low cost.
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01 Jan 2006
TL;DR: In this paper, a nanowires ofconducting polypyrrole (PPy) were synthesized by chemical polymerization methode and the reaction rate was 200rpm.
Abstract: Nanowires ofconducting polypyrrole (PPy)were synthesized bychemical polymerization methode. The0.18mol ofpyrrole (Py)asmonomer,0.18molofdodecyl-benzene sulfonic acid(DBSA)asdopantand0.26molofanhydrous iron( III) trichloride (FeCl3) asoxidant weremixedandstirred in200mlofdistilled waterat0'C. Thereaction wascarried outforthree different times (6h,24h,40h)andreaction rate was200rpm.Themorphology ofPPywasevaluated byfield emission scanning electron microscopy (FE-SEM). Itwas foundthatthemorphology ofnanowire PPywasaffected by reaction timeandaggregation rate. Whenthepolymerization timewasgetting longer, nanowire structure wasappeared clearly. Thesensitivities ofnanowire PPywereinvestigated withvolatile organic compounds (VOCs).
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References
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TL;DR: In this paper, a relaxation in the q-vector selection rule for the excitation of the Raman active optical phonons was proposed to increase the red shift and broadening of the signal from microcrystalline silicon films.
2,059 citations
"Selective acetone electrical detect..." refers methods in this paper
...Phonon confInement model (PCM) [14-15] which relates to Raman spectrum to crystal size, is used to calculate nano-crystallite size of nano-PS....
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TL;DR: In this article, the effect of the exact shape of the microcrystal and the relationship between the width, shift and asymmetry of the Raman line is calculated and is in good agreement with available experimental data.
1,957 citations
"Selective acetone electrical detect..." refers methods in this paper
...Phonon confInement model (PCM) [14-15] which relates to Raman spectrum to crystal size, is used to calculate nano-crystallite size of nano-PS....
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Book•
01 Jan 1997
TL;DR: In this paper, the authors present a collection of 50 commissioned essays on the subject from scientists in Europe, America and Japan, with the focus on the luminescence of silicon chips.
Abstract: Porous silicon has been the focus of much research activity in recent years, in view of its luminescence, which may enable light emitting devices to be integrated with silicon chips. This work comprises over 50 commissioned essays on the subject from scientists in Europe, America and Japan .
775 citations
TL;DR: In this article, all manifestations of pores in silicon are reviewed and discussed with respect to possible applications, with particular emphasis on macropores, which are classified in detail and reviewed in the context of pore formation models.
Abstract: All manifestations of pores in silicon are reviewed and discussed with respect to possible applications. Particular emphasis is put on macropores, which are classified in detail and reviewed in the context of pore formation models. Applications of macro-, meso-, and micropores are discussed separately together with some consideration of specific experimental topics. A brief discussion of a stochastic model of Si electrochemistry that was found useful in guiding experimental design for specific pore formation concludes the paper.
749 citations
"Selective acetone electrical detect..." refers background in this paper
...38 Porous silicon (PS) is an attractive material in chemical 39 and bio sensing due to high surface area to volume ratio, high 40 surface reactivity, ease of fabrication and luminescence at 41 room temperature [1]....
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TL;DR: This study demonstrates that monolayer and few-layer MoS2 nanosheets can be obtained from electrochemical exfoliation of bulk MoS3 crystals, and microscopic and spectroscopic characterizations indicate that the exfoliated MoS1 nanosHEets are of high quality and have an intrinsic structure.
Abstract: Molybdenum disulfide (MoS2) is an extremely intriguing material because of its unique electrical and optical properties. The preparation of large-area and high-quality MoS2 nanosheets is an important step in a wide range of applications. This study demonstrates that monolayer and few-layer MoS2 nanosheets can be obtained from electrochemical exfoliation of bulk MoS2 crystals. The lateral size of the exfoliated MoS2 nanosheets is in the 5–50 μm range, which is much larger than that of chemically or liquid-phase exfoliated MoS2 nanosheets. The MoS2 nanosheets undergo low levels of oxidation during electrochemical exfoliation. In addition, microscopic and spectroscopic characterizations indicate that the exfoliated MoS2 nanosheets are of high quality and have an intrinsic structure. A back-gate field-effect transistor was fabricated using an exfoliated monolayer MoS2 nanosheet. The on/off current ratio is over 106, and the field-effect mobility is approximately 1.2 cm2 V–1 s–1; these values are comparable to...
381 citations
"Selective acetone electrical detect..." refers background in this paper
...A combination of both porous structure 42 and large surface area of PS imply to a high sensitivity of 43 physical and chemical properties on the presence of chemical 44 compounds which make PS material very promising for 45 commercial sensors [2]....
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