• 한국전기화학회:학술대회논문집
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• 2000.04a
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• pp.37-37
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• 2000

• 한국전기화학회:학술대회논문집
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• 2001.04a
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• pp.54-54
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• 2001

• 한국전기화학회:학술대회논문집
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• 2002.04a
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• pp.21-21
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• 2002

• 한국전기화학회:학술대회논문집
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• 2000.10a
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• pp.53-53
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• 2000

• 한국전기화학회:학술대회논문집
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• 2001.10a
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• pp.14-14
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• 2001

• Applied Chemistry for Engineering
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• v.8 no.1
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• pp.114-121
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• 1997

The positive active material for polymer film-battery was prepared by using polyphenlenediamine(PPD) synthesized in our lab. and 2,5-dimercapto-1,3,4-thiadiazole(DMcT) with various mixture ratio. The transference measurement of surface morphology and thermal stability of the prepared composite film was carried out by using SEM and TGA, respectively. Electrochemical property and electrical conductivity of the composite film were also measured by using cyclic voltammetry and four-probe method in dry box, respectively. The thermal stability of prepared composite film was up to $200^{\circ}C$. The electrical conductivity of the composite film increased and showed the highest value(about 3 S/cm) when doped at 0.4% $LiCIO_4$ solution. And we could confirm that DMcT was effective on reactivation of PPD through cyclic voltammogram.

• KEPCO Journal on Electric Power and Energy
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• v.1 no.1
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• pp.169-174
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• 2015

In this research, pristine graphene was synthesized using methane ($CH_4$) gas, and N-doped graphene was synthesized using pyridine ($C_5H_5N$) liquid source by chemical vapor deposition (CVD) method. Basic optical properties of both pristine and N-doped graphene were investigated by Raman spectroscopy and XPS (X-ray photoemission spectroscopy), and electrical transport characteristics were estimated by current-voltage response of graphene channel as a function of gate voltages. Results for CVD grown pristine graphene from methane gas show that G-peak, 2D-peak and C1s-peak in Raman spectra and XPS. Charge neutral point (CNP; Dirac-point) appeared at about +4 V gate bias in electrical characterization. In the case of pyridine based CVD grown N-doped graphene, D-peak, G-peak, weak 2D-peak were observed in Raman spectra and C1s-peak and slight N1s-peak in XPS. CNP appeared at -96 V gate bias in electrical characterization. These result show successful control of the property of graphene artificially synthesized by CVD method.

• Proceedings of the Korean Vacuum Society Conference
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• 2011.08a
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• pp.181-181
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• 2011

The adsorption structure and the electronic property of azidotrimethyltin (ATMT) on monolayer graphene was investigated using scanning tunneling microscopy and core-level photoemission spectroscopy. We also confirmed the n-type doping effect by scanning tunneling spectroscopy and work function measurements. We will systematically demonstrate the variation of characteristic of graphene induced by the chemical functionalized molecule as we confirmed the results using scanning tunneling microscopy in conjunction with core-level photoemission spectroscopy.

• Korean Chemical Engineering Research
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• v.49 no.5
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• pp.505-509
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• 2011

Visible light-activated photocatalysts (based on doped titania) are the subject of intensive current research due to the promise they offer in relation to solar powered systems for photocatalysis, hybrid systems for $CO_2$ conversion and hydrogen production from water. Current synthetic methodologies suffer from one or more serious shortcomings, which seriously hinder practical application. These include high cost, irreproducibility, difficulty in controlling the dopant level and unsuitability for scale up. In this review new reproducible and controllable methods (developed by Lambert group, Cambridge University) allowing the synthesis of practical quantities of efficient, visible light active anion (e.g. N, C and B) doped $TiO_2$ photocatalysts are summarized.

• Korean Chemical Engineering Research
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• v.57 no.3
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• pp.331-337
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• 2019

Titania has become the most applicable material for photocatalytic application. Nevertheless, titania has the weak point in its wide band gap energy that is mainly activated by UV irradiation. There have been vast research challenges in order to make the wide band gap energy of titania narrow that could be activated in the presence of visible light. Various modifications of titania surface were popular because titania needs to change its surface to respond in visible light. Among the methodological approaches, N-doping to titania can be the alternative candidate because it is facile process and eco-friendly. The activated electron from valence band in N-doped $TiO_2$ migrates to conduction band in the presence of visible light irradiation, which shows photocatalytic activity as well. In this study, focused on the evaluation of nitrogen state after N-doping through brief review. Arguments are still existed in nitrogen states and their different effects on photocatalytic activity. In particular, two nitrogen states are generally reported; substitutional and interstitial states. The research articles regarding N-doped $TiO_2$ are continuously appearing because the potential application of water split in visible light is still fascinate. The future of N-doped $TiO_2$ is also presented by referrals based on various literature.