Polymer(Korea) (폴리머)

The Polymer Society of Korea (한국고분자학회)
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Fabrication of Hybrid Nanocomposites of PAA-grafted Graphene and Pd Nanoparticles having POSS (Pd-POSS)

그래핀과 실세스키옥세인을 포함한 팔라듐 나노입자와의 나노복합체 제조

  • Lim, Jung-Hyurk (Department of Polymer Science and Engineering, Korea National University of Transportation) ;
  • Ko, Yl-Woong (Department of Polymer Science and Engineering, Korea National University of Transportation) ;
  • Kim, Ki-Young (Department of Textile Convergence of Biotechnology & Nanotechnology, Korea Institute of Industrial Technology) ;
  • Kim, Kyung-Min (Department of Polymer Science and Engineering, Korea National University of Transportation)
  • 임정혁 (한국교통대학교 나노고분자공학과) ;
  • 고일웅 (한국교통대학교 나노고분자공학과) ;
  • 김기영 (한국생산기술연구원 바이오나노섬유융합연구그룹) ;
  • 김경민 (한국교통대학교 나노고분자공학과)
  • Received : 2012.04.11
  • Accepted : 2012.04.18
  • Published : 2012.09.25
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Abstract

The palladium nanoparticles were self-assembled to make Pd-POSS using POSS-$NH_3{^+}$ (polyhedral oligomeric silsesquioxane) as a crosslinker. Graphene oxide (GO) was produced by the reaction of graphite under a strong acid and oxidizer and poly(acrylic acid) (PAA) was covalently grafted on the surface of graphene to make PAA-grafted graphene through the radical polymerization of acrylic acid and GO along with a reduction process under $NaBH_4$. The nanocomposites of Pd-POSS and PAA-grafted graphene were fabricated via ionic interactions between positively charged Pd-POSS and negatively charged PAA-grafted graphene. Pd-POSS nanoparticles were attached to the surface of PAA-grafted graphene through ionic interactions. The thermal stability of Pd-POSS/PAA-grafted graphene was higher than that of PAA and PAA-grafted graphene. The composition, structure, surface morphology, and thermal stability of the Pd-POSS/PAA-grafted graphene were studied by FE-SEM, AFM, TEM, FTIR, and TGA.

케이지 구조의 POSS-$NH_3{^+}$를 이용하여 팔라듐 입자들의 자기 조직화로 인한 구조가 제어된 Pd-POSS 나노입자를 제조하였다. 또한 흑연을 강산과 산화제를 이용하여 산화된 그래핀 옥사이드(GO)를 합성한 후 얻어진 GO와 NaBH4와의 반응을 통하여 그래핀을 제조하였다. 합성된 그래핀과 acrylic acid와 라디칼 중합 반응을 통하여 그래핀 표면에 poly(acrylic acid)(PAA)가 결합된 PAA-grafted graphene을 얻었다. Pd-POSS와 PAA-grafted graphene을 이용한 나노복합체는 POSS-$NH_3{^+}$로 인하여 양전하를 띠는 Pd-POSS 나노입자와 PAA로 인하여 음전하를 띠는 PAA-grafted graphene와의 정전기적 인력을 이용하여 제조하였다. Pd-POSS 나노입자가 PAA로 치환된 그래핀 표면에 정전기적 인력으로 결합되어 있고, 나노복합체의 열적 안정성은 PAA와 PAA-grafted graphene 보다 우수한 것을 확인할 수 있었다. 제조된 Pd-POSS/PAA-grafted graphene 나노복합체의 구조 및 형태와 열적 안정성은 FE-SEM, AFM, TEM, EDX, FTIR과 TGA를 통하여 분석하였다.

Keywords

Acknowledgement

Supported by : 한국연구재단

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