• Title/Summary/Keyword: Photoelectron spectroscopy

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Preparation of Aminosiloxane-grafted Poly(imidesiloxane) Copolymer and its Morphology and Adhesive Properties in Film (아미노실록산이 그래프팅된 폴리(이미드실록산) 공중합체 제조와 필름 모폴로지 및 점착 특성 연구)

  • Lee, Ji Mok;Kwon, Eunjin;Lee, Sunyoung;Jung, Hyun Min
    • Polymer(Korea)
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    • v.37 no.4
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    • pp.547-552
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    • 2013

  • Polyimide (PI) containing carboxyl functional group was prepared and reacted with diaminosiloxane during high temperature film casting. The morphology of resulting film was observed by using transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDX), which revealed that globular 100 nm-sized PI domains and continuous polysiloxane phase were formed. X-ray photoelectron spectroscopy (XPS) study indicated that air-film interface mainly consisted of polysiloxane blocks. Poly(imidesiloxane) thin layer was thermostable until $400^{\circ}C$ and its pressure- sensitive adhesive property was retained up to $300^{\circ}C$. The comparative experiments revealed that grafting between carboxyl groups of polyimide and aminosiloxane was crucial for formation of microdomain structure and pressure-sensitive adhesive property.

  • https://doi.org/10.7317/pk.2013.37.4.547 인용 PDF KSCI

Friction and Wear Properties of Boron Carbide Coating under Various Relative Humidity

  • Pham Duc-Cuong;Ahn Hyo-Sok;Yoon Eui-Sung
    • KSTLE International Journal
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    • v.6 no.2
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    • pp.39-44
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    • 2005

  • Friction and wear properties of the Boron carbide ($B_{4}C$) coating 100 nm thickness were studied under various relative humidity (RH). The boron carbide film was deposited on silicon substrate by DC magnetron sputtering method using $B_{4}C$ target with a mixture of Ar and methane ($CH_4$) as precursor gas. Friction tests were performed using a reciprocation type friction tester at ambient environment. Steel balls of 3 mm in diameter were used as counter-specimen. The results indicated that relative humidity strongly affected the tribological properties of boron carbide coating. Friction coefficient decreased from 0.42 to 0.09 as the relative humidity increased from $5\%$ to $85\%$. Confocal microscopy was used to observe worn surfaces of the coating and wear scars on steel balls after the tests. It showed that both the coating surface and the ball were significantly worn-out even though boron carbide is much harder than the steel. Moreover, at low humidity ($5\%$) the boron carbide showed poor wear resistance which resulted in the complete removal of coating layer, whereas at the medium and high humidity conditions, it was not. X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES) analyses were performed to characterize the chemical composition of the worn surfaces. We suggest that tribochemical reactions occurred during sliding in moisture air to form boric acid on the worn surface of the coating. The boric acid and the tribochemcal layer that formed on steel ball resulted in low friction and wear of boron carbide coating.

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Characteristics of Organic Solar Cell having an Electron Transport Layer co-Deposited with ZnO Metal Oxide and Graphene using the Cyclic Voltammetry Method (순환전류법을 이용해 ZnO 금속산화물과 Graphene을 동시에 제막한 전자수송층을 갖는 유기태양전지의 특성)

  • Ahn, Joonsub;Han, Eunmi
    • Journal of the Microelectronics and Packaging Society
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    • v.29 no.1
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    • pp.71-75
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    • 2022

  • Graphene oxide was stirred with a ZnCl2:NaCl electrolyte and electrochemically coated by cyclic voltammetry to simplify the electron transpfer layer film forming process for organic solar cells and to fabricate an organic solar cell having it. The device structure is FTO/ZnO:graphene/P3HT:PCBM/PEDOT:PSS/Ag. Morphology and chemical properties of ETL were confirmed by scanning electron microscopy(SEM), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. As a result of XPS measurement, ZnO metal oxide and carbon bonding were simultaneously confirmed, and ZnO and graphene peaks were confirmed by Raman spectroscopy. The electrical characteristics of the manufactured solar cell were specified with a solar simulator, and the ETL device coated twice at a rate of 0.05 V/s showed the highest photoelectric conversion efficiency of 1.94%.

  • https://doi.org/10.6117/kmeps.2022.29.1.071 인용 PDF KSCI

방사광을 이용한 표면분석 기술: XPS

  • Park, Yong-Seop
    • Proceedings of the Korean Vacuum Society Conference
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    • 2012.02a
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    • pp.80-80
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    • 2012

  • 본 튜토리알에서는 표면 및 물질분석 기술로 널리 사용되고 있는 X-ray 광전자분광기술(X-ray Photoelectron Spectroscopy)의 원리와 광전자분광계를 구성하는 요소, 그리고 XPS를 이용하여 시료로부터 얻어낼 수 있는 정보가 무엇인지 등에 대해서 알아본다.

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