Gold nanomakura: nanoarchitectonics and their photothermal response in association with carrageenan hydrogels

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS

ACS Applied Bio Materials Pub Date : 2024-06-07 DOI:10.3762/bjnano.15.56

Nabojit Das, ‡. Vikas, Akash Kumar, Sanjeev Soni, R. Rayavarapu

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引用次数: 0

Abstract

Photothermal conversion of light into heat energy is an intrinsic optical property of metal nanoparticles when irradiated using near-infrared radiation. However, the impact of size and shape on the photothermal behaviour of gold nanomakura particles possessing optical absorption within 600–700 nm as well as on incorporation in hydrogels is not well reported. In this study, nanomakura-shaped anisotropic gold nanoparticles (AuNMs) were synthesized via a surfactant-assisted seed-mediated protocol. Quaternary cationic surfactants having variable carbon tail length (n = 16, 14, 12) were used as capping for tuning the plasmon peak of gold nanomakura within a 600–700 nm wavelength. The aspect ratio as well as anisotropy of synthesized gold nanomakura can influence photothermal response upon near-infrared irradiation. The role of carbon tail length was evident via absorption peaks obtained from longitudinal surface plasmon resonance analysis at 670, 650, and 630 nm in CTAB-AuNM, MTAB-AuNM, and DTAB-AuNM, respectively. Furthermore, the impact of morphology and surrounding milieu of the synthesized nanomakuras on photothermal conversion is investigated owing to their retention of plasmonic stability. Interestingly, we found that photothermal conversion was exclusively assigned to morphological features (i.e., nanoparticles of higher aspect ratio showed higher temperature change and vice versa irrespective of the surfactant used). To enable biofunctionality and stability, we used kappa-carrageenan- (k-CG) based hydrogels for incorporating the nanomakuras and further assessed their photothermal response. Nanomakura particles in association with k-CG were also able to show photothermal conversion, depicting their ability to interact with light without hindrance. The CTAB-AuNM, MTAB-AuNM, and DTAB-AuNM after incorporation into hydrogel beads attained up to ≈17.2, ≈17.2, and ≈15.7 °C, respectively. On the other hand, gold nanorods after incorporation into k-CG did not yield much photothermal response as compared to that of AuNMs. The results showed a promising platform to utilize nanomakura particles along with kappa-carrageenan hydrogels for enabling usage on nanophotonic, photothermal, and bio-imaging applications.

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纳米金仓：纳米结构及其与卡拉胶水凝胶的光热反应

用近红外辐射照射金属纳米粒子时，光能转化为热能是其固有的光学特性。然而，关于尺寸和形状对具有 600-700 纳米光吸收的纳米樱金粒子的光热行为以及与水凝胶结合的影响，目前还没有很好的报道。本研究通过表面活性剂辅助的种子介导方案合成了纳米樱形各向异性金纳米粒子（AuNMs）。具有可变碳尾部长度（n = 16、14、12）的季铵阳离子表面活性剂被用作封端，用于在 600-700 纳米波长范围内调节纳米金马库拉的等离子峰。合成的金纳米村的长宽比和各向异性会影响近红外照射时的光热响应。在 CTAB-AuNM、MTAB-AuNM 和 DTAB-AuNM 中，通过纵向表面等离子体共振分析获得的吸收峰分别在 670、650 和 630 纳米波长处，碳尾长度的作用显而易见。此外，我们还研究了合成的纳米瘤的形态和周围环境对光热转换的影响，因为它们保持了等离子体稳定性。有趣的是，我们发现光热转换完全归因于形态特征（即无论使用何种表面活性剂，高宽比的纳米粒子显示出更高的温度变化，反之亦然）。为了实现生物功能性和稳定性，我们使用了基于卡帕卡拉胶（k-CG）的水凝胶来加入纳米樱，并进一步评估了它们的光热反应。与 k-CG 结合在一起的纳米樱颗粒也能进行光热转换，这说明它们能够不受阻碍地与光相互作用。将 CTAB-AuNM、MTAB-AuNM 和 DTAB-AuNM 加入水凝胶珠后，温度分别高达 ≈17.2、≈17.2 和 ≈15.7℃。另一方面，与 AuNMs 相比，掺入 k-CG 后的金纳米棒产生的光热响应并不明显。研究结果表明，纳米樱颗粒与卡帕卡拉胶水凝胶是一个很有前景的平台，可用于纳米光子、光热和生物成像应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

ACS Applied Bio Materials Chemistry-Chemistry (all)

CiteScore

9.40

自引率

2.10%

发文量

464

期刊介绍： ACS Applied Bio Materials is an interdisciplinary journal publishing original research covering all aspects of biomaterials and biointerfaces including and beyond the traditional biosensing, biomedical and therapeutic applications. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important bio applications. The journal is specifically interested in work that addresses the relationship between structure and function and assesses the stability and degradation of materials under relevant environmental and biological conditions.