Preparation of Silver Nanoparticles Deposited on TEMPO-Oxidized Cellulose Nanofibers

Solid State Phenomena Pub Date : 2024-03-18 DOI:10.4028/p-hgi67k

Phatharaporn Phaonoeng, S. Tanpichai, A. Boonmahitthisud

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Abstract

Silver nanoparticles (AgNPs) were synthesized by a chemical method in which cellulose nanofibers (CNFs) extracted from pineapple leaves served as a stabilizing and reducing agent. In this study, pineapple leaves were oxidized by the 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-mediated oxidation with sodium hypochlorite (NaClO) to obtain CNFs. After the oxidation, the transformation from hydroxyl groups to carboxylate groups of cellulose was confirmed by Fourier-transform infrared spectroscopy (FTIR), and TEMPO-oxidized CNFs with a higher carboxylate content were obtained. Then, TEMPO-oxidized CNFs with a carboxylate content of 2.49 mmol/g and non-oxidized CNFs with a carboxylate content of 0.68 mmol/g were used as a reducing agent to synthesize AgNPs. The formation of AgNPs was confirmed by color changes of the Ag solutions from white to yellow. Furthermore, AgNPs with an average diameter of 76.5 ± 22.15 nm were obtained when TEMPO-oxidized CNFs were used as a reducing agent, while non-oxidized CNFs generated AgNPs with a larger particle size of 181.2 ± 66.16 nm. This suggested that the TEMPO-oxidized CNFs could be used as a stabilizing and reducing agent for the synthesis of AgNPs with smaller diameters.

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制备沉积在 TEMPO 氧化纤维素纳米纤维上的银纳米粒子

通过化学方法合成了银纳米粒子（AgNPs），其中从菠萝叶中提取的纤维素纳米纤维（CNFs）可作为稳定剂和还原剂。在这项研究中，菠萝叶被次氯酸钠（NaClO）介导的 2,2,6,6-四甲基哌啶-1-氧（TEMPO）氧化，得到 CNFs。氧化后，傅立叶变换红外光谱（FTIR）证实了纤维素羟基向羧基的转变，并得到了羧基含量较高的 TEMPO 氧化 CNFs。然后，以羧酸盐含量为 2.49 mmol/g 的 TEMPO 氧化 CNFs 和羧酸盐含量为 0.68 mmol/g 的未氧化 CNFs 为还原剂，合成 AgNPs。AgNPs 的形成通过 Ag 溶液颜色从白色变为黄色得到证实。此外，当使用 TEMPO 氧化 CNF 作为还原剂时，可获得平均直径为 76.5 ± 22.15 nm 的 AgNPs，而未氧化 CNF 生成的 AgNPs 的粒径较大，为 181.2 ± 66.16 nm。这表明 TEMPO 氧化的 CNFs 可用作稳定剂和还原剂，用于合成直径较小的 AgNPs。

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来源期刊

Solid State Phenomena

CiteScore

1.00

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0.00%

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