Silver Nanoparticles for Colorimetric Dual Ion Sensing and Development of Paper Sensors: A Strategy Towards Waste Valorisation and Sustainability

IF 3.3 4区物理与天体物理 Q2 CHEMISTRY, PHYSICAL

Plasmonics Pub Date : 2024-08-06 DOI:10.1007/s11468-024-02431-0

Rugmini R., B. D. Sri Chandana, K. C. Sekhar

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引用次数: 0

Abstract

Iron and copper are essential for all living organisms, and their balance is crucial as both deficiency and excess can cause health problems. Therefore, this study presents a colorimetric method for detecting Fe³⁺ and Cu²⁺ ions in aqueous samples using silver nanoparticles (AgNPs) synthesised from Ocimum sanctum (Tulasi) leaf extract (TLE). It is observed that AgNPs show optimum plasmonic properties at a precursor-leaf extract ratio of 1:5, reaction temperature of 60 °C and reaction time of 2 h. The AgNPs exhibit the face-centred cubic (fcc) structure and show a surface plasmon resonance peak at 413 nm, hydrodynamic size of 18 ± 5 nm, zeta potential of − 25.5 mV and particle size of 57 nm. FTIR spectra confirm the stabilisation of AgNPs. It is worthy to note that, AgNPs exhibit selective detection of Fe³⁺ and Cu²⁺ over other metal ions and the detection mechanism is proposed based on the reduction potential values. The quantitative detection range for Fe³⁺ and Cu²⁺ are found to be 0–800 μM and 0–600 μM, with the detection limits of 9.1 µM and 19.5 µM, respectively. Additionally, AgNP-based paper sensors for Cu²⁺ detection show qualitative and quantitative colorimetric performance with a detection limit of 23.1 µM. These findings suggest that both AgNPs solution and AgNP-based paper sensors are the potential candidates for metal ion detection.

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用于比色双离子传感和纸张传感器开发的纳米银颗粒：实现废物价值化和可持续性的策略

铁和铜是所有生物体的必需元素，它们之间的平衡至关重要，因为缺乏或过量都会导致健康问题。因此，本研究提出了一种使用银纳米粒子（AgNPs）检测水样中 Fe3⁺和 Cu2⁺离子的比色法，银纳米粒子是由 Ocimum sanctum（Tulasi）叶提取物（TLE）合成的。AgNPs 呈面心立方（fcc）结构，在 413 纳米处显示出表面等离子共振峰，流体力学尺寸为 18 ± 5 纳米，Zeta 电位为 - 25.5 mV，粒径为 57 纳米。傅立叶变换红外光谱证实了 AgNPs 的稳定。值得注意的是，与其他金属离子相比，AgNPs 对 Fe3⁺ 和 Cu2⁺ 的检测具有选择性，其检测机制是基于还原电位值提出的。研究发现，Fe3⁺ 和 Cu2⁺ 的定量检测范围分别为 0-800 μM 和 0-600 μM，检测限分别为 9.1 µM 和 19.5 µM。此外，用于检测 Cu2⁺ 的基于 AgNP 的纸传感器显示出定性和定量的比色性能，检测限为 23.1 µM。这些研究结果表明，AgNPs 溶液和基于 AgNPs 的纸传感器都有可能用于金属离子检测。

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来源期刊

Plasmonics 工程技术-材料科学：综合

CiteScore

5.90

自引率

6.70%

发文量

164

审稿时长

2.1 months

期刊介绍： Plasmonics is an international forum for the publication of peer-reviewed leading-edge original articles that both advance and report our knowledge base and practice of the interactions of free-metal electrons, Plasmons. Topics covered include notable advances in the theory, Physics, and applications of surface plasmons in metals, to the rapidly emerging areas of nanotechnology, biophotonics, sensing, biochemistry and medicine. Topics, including the theory, synthesis and optical properties of noble metal nanostructures, patterned surfaces or materials, continuous or grated surfaces, devices, or wires for their multifarious applications are particularly welcome. Typical applications might include but are not limited to, surface enhanced spectroscopic properties, such as Raman scattering or fluorescence, as well developments in techniques such as surface plasmon resonance and near-field scanning optical microscopy.