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RISS 인기검색어
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- 저자 : 알센바바쟈얀 (검색결과 4 건)
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Sensing of Glucose Concentration by Using a Surface Plasmon Polariton
알센바바쟈얀,이기진,Khachatur Nerkararyan,Robert Khachatryan 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.2
We measured the glucose concentration by using the excitation of a surface plasmon polariton (SPP) with the gold-coated end of an optical fiber. The glucose concentration was proportional to the signal intensity of the SPP. We could observe the concentration of glucose with a detectable resolution up to 0.5 mg/ml. Depending on the glucose concentration in the aqueous solution, the activated resonance due to the SPP could be observed, and the intensity was changed by changes of the permittivity of the glucose solution. The measured signal-to-noise ratio was about 48 dB, and the minimum detectible signal was about 0.002 (mg/ml)-¹. We measured the glucose concentration by using the excitation of a surface plasmon polariton (SPP) with the gold-coated end of an optical fiber. The glucose concentration was proportional to the signal intensity of the SPP. We could observe the concentration of glucose with a detectable resolution up to 0.5 mg/ml. Depending on the glucose concentration in the aqueous solution, the activated resonance due to the SPP could be observed, and the intensity was changed by changes of the permittivity of the glucose solution. The measured signal-to-noise ratio was about 48 dB, and the minimum detectible signal was about 0.002 (mg/ml)-¹.
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Investigation of CdS Films Prepared by Using Chemical Bath Deposition
이기진,알센바바쟈얀,Tigran Sargsyan,차덕준 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.2
Cadmium-sulphide (CdS) films were prepared on glass substrates by using a chemical bath deposition method. The dependences of the microstructures and the morphologies of CdS films on the annealing temperatures were investigated by using X-ray diffraction, scanning electron microscopy and atomic force microscopy. The change in the sheet resistance due to dierent annealing temperatures was studied by using a near-eld microwave microprobe by measuring the reflection coefficient S11. As the annealing temperature increased from room temperature to 300 ℃, the sheet resistance of the CdS films decreased, the surface roughness and grain size decreased and the surface showed a smoother morphology.
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Noncontact characterization of glucose by a waveguide microwave probe
김승완,Jongchel Kim,알센바바쟈얀,이기진,Barry Friedman 한국물리학회 2009 Current Applied Physics Vol.9 No.4
We investigate the electromagnetic field interaction with a glucose aqueous solution using a microwave dielectric waveguide probe to evaluate the glucose concentrations. A microwave dielectric waveguide probe allows observation of the small variation of the glucose concentration changes in the range of 0–300 mg/ml by measuring the change of the microwave reflection coefficient. We could observe the effect of concentration change of glucose with a detectable resolution up to 0.5 mg/ml at an operating frequency of about f = 2.0–2.5 GHz. The change of the glucose concentration is directly related to the change of the reflection coefficient due to the electromagnetic interaction between the dielectric waveguide resonator and the glucose aqueous solution. The operational principal is explained by a plane-wave solution model. A glucose biosensor using a microwave dielectric waveguide probe provides a unique approach for glucose monitoring.
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황진호,김두리,김민우,이한주,알센바바쟈얀,Levon ODABASHYAN,Zhirayr BAGHDASARYAN,이기진,차덕준 한국물리학회 2018 새물리 Vol.68 No.11
We studied the electrical properties of organic thin-film transistors (OTFTs) fabricated at different deposition rates by measuring the field-effect mobility and the threshold voltages. As the active layer, pentacene thin film with a thickness of 50 nm was deposited at a rate of 0.05 Å/s to 1.14 Å/s. The thickness of the drain-source gold electrode was 50 nm. The mobility was 1.9 $\times$ 10$^{-1}$ cm$^2$/V$\cdot$s at a deposition rate of 0.05 Å/s, the mobility increased to 5.2 $\times$ 10$^{-1}$ cm$^2$/V$\cdot$s when the deposition rate was increased to 0.4 Å/s, and then the mobility decreased to 6.5 $\times$ 10$^{-2}$ cm$^2$/V$\cdot$s when the deposition rate decreased to 1.14 Å/s. Thus, the mobility of pentacene OTFTs was observed to depend on the thermal deposition rate. 본 연구는 각각 다른 증착 속도로 제작된 유기 박막 트랜지스터(organic thin film transistor, OTFT)의 전하 이동도와 문턱 전압을 측정하여 전기적 성질을 분석했다. OTFT의 활성층으로, 펜타센 (pentacene)을 0.05 Å/s $\sim$ 1.14 Å/s의 증착 속도에 따라 50 nm의 두께로 진공 열 증착했다. 드레인-소스 전극은 금 (Au)을 50 nm의 두께로 증착했다. 펜타센 증착 속도가 0.05 Å/s일 때 전하 이동도는 1.9 $\times$ 10$^{-1}$ cm$^2$/V$\cdot$s 였고, 증착 속도가 0.4 Å/s로 증가함에 따라 전하 이동도는 5.2 $\times$ 10$^{-1}$ cm$^2$/V$\cdot$s 로 증가했으며, 증착 속도가 1.14 Å/s로 증가함에 따라 전하 이동도는 6.5 $\times$ 10$^{-2}$ cm$^2$/V$\cdot$s 로 감소했다. 따라서, 펜타센 기반의 OTFT의 전하 이동도는 열 증착 속도에 의존함을 관측하였다.
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