• 대한안전경영과학회지
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• 제2권3호
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• pp.197-210
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• 2000

In this paper, sensor ring for antilock brake system was studied using the 400 series ferrite stainless steel powder. Because of more excellent corrosion resistance and mechanical characteristics than iron, sensor ring has been manufactured by P/M(Powder Metallurgy) method 400 series ferrite stainless steel. the results are following. 1, Compared with sensor ring made by iron, 400 series ferrite stainless steel has shown a good corrosion resistance without an addition surface treatment. thus the decreasing production process has been obtained. 2. The products before sintering are much more corrodible in the condition of spray test of salt water and ammonia than humidity and nitrogen condition.

• 대한화학회지
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• 제34권6호
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• pp.622-628
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• 1990

장미 구성요소 중 꽃잎 부분을 $NH_3$ 감응센서에 고정시켜서 글루타민 조직센서를 제조하여 pH, 완충용액, 조직 양 및 여러 가지 방해물질의 영향과 전극의 수명 등에 관하여 조사하였다. 그 결과 37$^{\circ}C$에서 pH 7.8, 0.2M 인산완충용액을 사용하였을 때, $8.0 {\times} 10^{-4}$ ∼$5.0 {\times} 10^{-2}$ M 글루타민 직선범위와 52 mV/decade의 감응기울기를 나타내었다. 이 때 사용한 조직 양은 50 mg이었다. 본 센서는 선택성이 탁월한 것으로 나타났다. 이 센서를 장미의 다른 구성요소와 비교하였다. 실제 글루타민의 정량에 유용하게 사용될 것으로 나타났다.

• 한국재료학회지
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• 제33권5호
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• pp.195-204
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• 2023

Micro-electronic gas sensor devices were developed for the detection of carbon monoxide (CO), nitrogen oxides (NO_x), ammonia (NH₃), and formaldehyde (HCHO), as well as binary mixed-gas systems. Four gas sensing materials for different target gases, Pd-SnO₂ for CO, In₂O₃ for NO_x, Ru-WO₃ for NH₃, and SnO₂-ZnO for HCHO, were synthesized using a sol-gel method, and sensor devices were then fabricated using a micro sensor platform. The gas sensing behavior and sensor response to the gas mixture were examined for six mixed gas systems using the experimental data in MEMS gas sensor arrays in sole gases and their mixtures. The gas sensing behavior with the mixed gas system suggests that specific adsorption and selective activation of the adsorption sites might occur in gas mixtures, and allow selectivity for the adsorption of a particular gas. The careful pattern recognition of sensing data obtained by the sensor array made it possible to distinguish a gas species from a gas mixture and to measure its concentration.

• 한국재료학회지
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• 제26권4호
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• pp.187-193
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• 2016

Fabrication of iron oxide/carbon nanotube composite structures for detection of ammonia gas at room temperature is reported. The iron oxide/carbon nanotube composite structures are fabricated by in situ co-arc-discharge method using a graphite source with varying numbers of iron wires inserted. The composite structures reveal higher response signals at room temperature than at high temperatures. As the number of iron wires inserted increased, the volume of carbon nanotubes and iron nanoparticles produced increased. The oxidation condition of the composite structures varied the carbon nanotube/iron oxide ratio in the structure and, consequently, the resistance of the structures and, finally, the ammonia gas sensing performance. The highest sensor performance was realized with $500^{\circ}C/2h$ oxidation heat-treatment condition, in which most of the carbon nanotubes were removed from the composite and iron oxide played the main role of ammonia sensing. The response signal level was 62% at room temperature. We also found that UV irradiation enhances the sensing response with reduced recovery time.

• 센서학회지
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• 제20권6호
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• pp.400-405
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• 2011

This study introduced the development of a strip type disposable enzyme-linked immunosensor platform for the detection of IgG. Strips of the strip sensor were fabricated by using commercial nitrocellulose filter membranes and a housing holder for the strips was manufactured by using a standard injection molding process for a plastic material. An IgG-urease conjugate was prepared and used for the competitive immune-binding with sample IgG. From the enzymatic reaction between the conjugated urease and urea added, ammonia was generated and caused a localized alkaline pH change on the immobilized antibody band which was coated onto the sensor strips. This pH increase subsequently caused a color change of the antibody band in the presence of a pH indicator, phenol red. Used in conjunction with a competitive immunoassay format, the intensity of the color produced is directly linked with the concentration of target analyte, IgG, and specific measurement of IgG in a lateral flow immunoassay format was achieved over the range 100 ppb to 2000 ppb IgG.

• 대한화학회지
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• 제36권2호
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• pp.218-222
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• 1992

시티딘은 장미조직이 가지고 있는 시티딘 디아미나제에 의해 우리딘과 암모니아 기체를 생성한다. 이 장미조직 50mg을 암모니아 기체감응센서에 고정시켜 장미조직센서를 제조하고, 수용액 중의 시티딘을 정량하는데 최적 실험조건을 조사하였다. pH8.4, 온도 37$^{\circ}C$, 0.2M 인산 완충용액을 사용하였을 때 시티딘의 농도가 $7.0 {\times}10^{-4}$에서 $1.0{\times}10^{-2}$M까지 직선이었고, 53mV/decade의 감응기울기를 나타내었다. 검출한계는 $3.0 {\times} 10^{-4}$ M 상대표준편차는 3.4%였다. 또한 이 조직센서는 선택성이 탁월하였다.

• 대한안전경영과학회지
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• 제2권4호
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• pp.197-208
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• 2000

ABS sensor ring has been manufactured by powder metallurgy (P/M) method using 400 series ferrite stainless steel. The results are following. It is supposedly sufficient to use for control computer due to good experimental results of magnetic characteristics. Compared with sensor ring made by iron, 400 series ferrite stainless steel has shown a good corrosion resistance without an addition surface treatment. Thus the decreasing production process has been obtained. As a result mechanical characteristics of hardness and tensile test, 400 series ferrite stainless steel shown a good endurance when it is combined to constant velocity joint(C/V), and has a good hardness properties endurable to sand and pebble impact. The products before sintering are much more corrodible in the condition of spray test of salt water and ammonia than humidity and nitrogen condition.

• 한국재료학회:학술대회논문집
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• 한국재료학회 2011년도 춘계학술발표대회
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• pp.242.2-242.2
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• 2011

Molecularly imprinted polymer thin films were applied to develop a gas sensor based on the surface plasmon resonance phenomenon for small gaseous molecules such as toluene and xylene. The imprinted polymer films were synthesized via photo-polymerization method using various combination of templates, functional monomers and cross-linkers. The temperature of pre-polymerization solutions and the power of UV light were controlled for optimized performance of gas sensing. The morphology and porosity of the polymer films were controlled by varying the mixing ratios of the pre-polymerization solutions and confirmed by atomic force microscopy. By fitting the adsorption/desorption sensorgrams to conventional kinetic models, the effects of different templates and cross-linkers were interpreted in term of the structural differences of the polymer networks formed on the gold film. The sensitivity and selectivity of sensors were estimated for toluene and xylene, and also for humidity and other gaseous molecules such as formaldehyde and ammonia.

• 대한안전경영과학회지
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• 제5권1호
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• pp.129-141
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• 2003

In this thesis, using the 400 series ferrite stainless steel such as 434LD$_2$ which are furter excellent then the existing ferric products in mechanical characteristics, and experiment has been conducted on corrosion resistance of sensor ring. The results are following. 1. The products before sintering are much more corrodible in the condition of spray test of salt water and ammonia than humidity and nitrogen condition. 2. 434LD$_2$ ferrite stainless steel has shown a good corrosion resistance without an addition surface treatment. thus the decreasing production process has been obtained. 3. As hardness value of $H_{RB}$ 80 and tensile test, 434LD$_2$ ferrite stainless steel with show a good endurance when it is combined to constant velocity joint (c/v joint), and has a good hardness properties endurable to sand and pebble impact.

• 대한화학회지
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• 제35권1호
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• pp.38-45
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• 1991

Proteus mirabilis균과 organelle를 NH$_3$ 기체감응전극에 고정시켜 cytidine에 대한 바이오센서를 제조하였다. 박테리아 센서에 대한 pH, 온도, 완충용액, 균량 및 방해물질의 영향과 수명을 조사하였다. 그 결과 0.1M phosphate 완충용액에서 pH 7.8, 온도 30$^{\circ}C$, 균량 3mg이었을 때, 5.0 ${times}$ 10$^{-4}$M ∼ 1.0 ${times}$ 10$^{-2}$M cytidine 직선범위 내에서 56 mV/decade 의 감응기울기를 나타내었다. 이 박테리아 전극의 감응특성을 organelle 전극의 경우와 비교하였다.