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A novel DC microplasma sensor constructed in a cavity PDMS chamber with needle electrodes for fast detection of methanol-containing spirit.

Luo DB, Duan YX, He Y, Gao B - Sci Rep (2014)

Bottom Line: This property is beneficial for spectrometric detection of many volatile organics in this chamber.Significant differences are observed upon the introduction of the spirit and the methanol-containing spirit samples.A detection limit of 0.3% is obtained on this microplasma device.

View Article: PubMed Central - PubMed

Affiliation: 1] Analytical &Testing Center, Sichuan University [2] Research Center of Analytical Instrumentation, Key laboratory of bio-resource and eco environment, ministry of education, College of Life Sciences, Sichuan University.

ABSTRACT
A novel microplasma device, for the first time, was constructed in a cavity Poly (dimethylsiloxane) (PDMS) chamber with two normal syringe needles serve as both the gas channels and the electrodes. This device employs argon plasma with direct current for molecular fragmentation and excitation. The microplasma is generated at atmospheric pressure in the PDMS chamber of 0.5 mL (5 × 10 × 10 mm(3)) volume with a sealable plug. Since the microplasma is maintained in a chamber by separation of the discharge zone and the substrate, stability for a long time of the microplasma is realized which could be observed by argon background emission fluctuation and SEM characterization. This property is beneficial for spectrometric detection of many volatile organics in this chamber. Besides, this kind of microplasma sensor has advantages such as flexibility in replacement of electrodes, convenience in clearance of the discharge chamber, small instrument volume, simple structure, and ease of operation. In addition, methanol-containing spirit samples were chosen to estimate the detecting performance of this microplasma for volatile organic compounds (VOCs) analysis by molecular emission spectrometry. Significant differences are observed upon the introduction of the spirit and the methanol-containing spirit samples. A detection limit of 0.3% is obtained on this microplasma device.

No MeSH data available.


Related in: MedlinePlus

Measurement setup.Schematic diagram of the experimental setup.
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f8: Measurement setup.Schematic diagram of the experimental setup.

Mentions: Diagrammatic representation of the experiment setup is shown in Figure 8. Operation in argon gas was attained using a mass flow controller. A glass vessel with a PDMS seal, which served as a sample introduction trap, was placed in the front of the NMCPC device in the gas route. The plasma was generated in a constant voltage mode from 300 to 1000 V, employing an argon flow rate of 250 mL min−1. The inlet needle was connected to the cathode while the outlet needle to the anode with copper wires because many emission peaks are stronger in the cathode glow19. The light emitted from the rectangular plasma chamber was picked by a quartz optical fiber and guided to an Ocean Optics S2000 spectrometer (grating, 600 lines mm−1; slit width, 50 μm). The light intensity for all optical emission spectra in this work was given in units of detector counts. Each typical spectrum was recorded between 200 and 1000 nm. A portable PC connecting the optical fiber was employed for the emission spectra data collection.


A novel DC microplasma sensor constructed in a cavity PDMS chamber with needle electrodes for fast detection of methanol-containing spirit.

Luo DB, Duan YX, He Y, Gao B - Sci Rep (2014)

Measurement setup.Schematic diagram of the experimental setup.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4264012&req=5

f8: Measurement setup.Schematic diagram of the experimental setup.
Mentions: Diagrammatic representation of the experiment setup is shown in Figure 8. Operation in argon gas was attained using a mass flow controller. A glass vessel with a PDMS seal, which served as a sample introduction trap, was placed in the front of the NMCPC device in the gas route. The plasma was generated in a constant voltage mode from 300 to 1000 V, employing an argon flow rate of 250 mL min−1. The inlet needle was connected to the cathode while the outlet needle to the anode with copper wires because many emission peaks are stronger in the cathode glow19. The light emitted from the rectangular plasma chamber was picked by a quartz optical fiber and guided to an Ocean Optics S2000 spectrometer (grating, 600 lines mm−1; slit width, 50 μm). The light intensity for all optical emission spectra in this work was given in units of detector counts. Each typical spectrum was recorded between 200 and 1000 nm. A portable PC connecting the optical fiber was employed for the emission spectra data collection.

Bottom Line: This property is beneficial for spectrometric detection of many volatile organics in this chamber.Significant differences are observed upon the introduction of the spirit and the methanol-containing spirit samples.A detection limit of 0.3% is obtained on this microplasma device.

View Article: PubMed Central - PubMed

Affiliation: 1] Analytical &Testing Center, Sichuan University [2] Research Center of Analytical Instrumentation, Key laboratory of bio-resource and eco environment, ministry of education, College of Life Sciences, Sichuan University.

ABSTRACT
A novel microplasma device, for the first time, was constructed in a cavity Poly (dimethylsiloxane) (PDMS) chamber with two normal syringe needles serve as both the gas channels and the electrodes. This device employs argon plasma with direct current for molecular fragmentation and excitation. The microplasma is generated at atmospheric pressure in the PDMS chamber of 0.5 mL (5 × 10 × 10 mm(3)) volume with a sealable plug. Since the microplasma is maintained in a chamber by separation of the discharge zone and the substrate, stability for a long time of the microplasma is realized which could be observed by argon background emission fluctuation and SEM characterization. This property is beneficial for spectrometric detection of many volatile organics in this chamber. Besides, this kind of microplasma sensor has advantages such as flexibility in replacement of electrodes, convenience in clearance of the discharge chamber, small instrument volume, simple structure, and ease of operation. In addition, methanol-containing spirit samples were chosen to estimate the detecting performance of this microplasma for volatile organic compounds (VOCs) analysis by molecular emission spectrometry. Significant differences are observed upon the introduction of the spirit and the methanol-containing spirit samples. A detection limit of 0.3% is obtained on this microplasma device.

No MeSH data available.


Related in: MedlinePlus