Efficient decoration of graphene oxide with a narrow size distribution of noble metal nanoparticles: Green reduction and integration into a thermoelastic composite

IF 4 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Synthetic Metals Pub Date : 2025-05-27 DOI:10.1016/j.synthmet.2025.117894

D. Vella , D. Vengust , P. Umek , A. Rezaei , M. Jezeršek , A. Mrzel

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Abstract

We have developed a significantly enhanced method for the effective and homogeneous decoration of graphene oxide (GO) and reduced graphene oxide (r-GO) flakes with gold (Au) and platinum (Pt) nanoparticles. This method involves the direct nucleation of nanoparticles on the surface of dispersed GO through a single-step reaction. By carefully controlling the stepwise introduction of gold and platinum complexes at elevated temperatures, without additional reducing agents, we successfully achieved a homogeneous distribution of Au and Pt nanoparticles, ∼ 20 nm and ∼ 3 nm in size, densely covering the GO sheets. The decoration yield in a mass ratio between Au and GO was up to 20 %. Reduced GO with attached gold and platinum nanoparticles was obtained using ascorbic acid as a reducing agent. Finally, we embedded Au-decorated r-GO in polydimethylsiloxane (PDMS) to form a composite. We show how this stable hybrid material composite can be spin-coated to form a thin thermoelastic film on a flexible substrate, enabling promising photoacoustic properties that could be exploited further in biomedical applications.

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用窄尺寸分布的贵金属纳米颗粒高效修饰氧化石墨烯：绿色还原并整合成热弹性复合材料

我们开发了一种显著增强的方法，可以用金（Au）和铂（Pt）纳米颗粒有效和均匀地装饰氧化石墨烯（GO）和还原氧化石墨烯（r-GO）薄片。该方法通过一步反应在分散的氧化石墨烯表面直接形成纳米颗粒成核。通过仔细控制在高温下逐步引入金和铂配合物，在没有额外还原剂的情况下，我们成功地实现了Au和Pt纳米颗粒的均匀分布，尺寸分别为~ 20 nm和~ 3 nm，密集地覆盖在氧化石墨烯薄片上。在Au与GO的质量比下，装饰收率可达20% %。以抗坏血酸为还原剂，制备了附着金和铂纳米颗粒的氧化石墨烯。最后，我们将au修饰的r-氧化石墨烯嵌入聚二甲基硅氧烷（PDMS）中形成复合材料。我们展示了这种稳定的杂化材料复合材料如何被自旋涂覆，在柔性基板上形成一层薄薄的热弹性膜，从而实现了有前途的光声特性，可以在生物医学应用中进一步开发。

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来源期刊

Synthetic Metals 工程技术-材料科学：综合

CiteScore

8.30

自引率

4.50%

发文量

189

审稿时长

33 days

期刊介绍： This journal is an international medium for the rapid publication of original research papers, short communications and subject reviews dealing with research on and applications of electronic polymers and electronic molecular materials including novel carbon architectures. These functional materials have the properties of metals, semiconductors or magnets and are distinguishable from elemental and alloy/binary metals, semiconductors and magnets.