A dual-mode fluorescent probe for temperature-sensing and metal ions detection based on castor leaves-derived carbon quantum dots

IF 5.5 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Carbon Letters Pub Date : 2025-01-19 DOI:10.1007/s42823-024-00847-6

Avinash Kumar, Ishant Kumar, Sandeep Kumar, Anchal Sharma, Amit Sharma, Arvind K. Gathania

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引用次数: 0

Abstract

This study incorporates the formation of carbon quantum dots (CQDs) via a hydrothermal approach, recording the first-time use of castor leaves as a natural precursor. The used precursor offers various benefits including novelty, abundance, elemental composition, and biocompatibility. CQDs were further characterized with multiple techniques including high-resolution transmission electron microscope (HR-TEM), X-ray photoelectron microscopy (XPS), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, UV–visible spectroscopy, Zeta analysis, and optical spectroscopy. They are fundamentally composed of carbon (71.37%), nitrogen (3.91%), and oxygen (24.73%) and are nearly spherical, and uniformly distributed with an average diameter of 2.7 nm. They possess numerous interesting characteristics like broad excitation/emission bands, excitation-sensitive emission, marvelous photostability, reactivity, thermo-sensitivity, etc. A temperature sensor (thermal sensitivity of 0.58% C⁻¹) with repeatability and reversibility of results is also demonstrated. Additionally, they were found selective and sensitive to ions in aqueous solutions. So, they are also utilized as a fluorescent probe for metal ion (Fe³⁺) sensing. The lowest limit of detection (LOD) value for the current metal ion sensor is 19.1 µM/L.

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基于蓖麻叶衍生碳量子点的温度传感和金属离子检测双模荧光探针

本研究结合了通过水热方法形成碳量子点（CQDs），记录了蓖麻叶作为天然前体的首次使用。所使用的前体提供各种益处，包括新颖性、丰度、元素组成和生物相容性。采用高分辨率透射电子显微镜（HR-TEM）、x射线光电子显微镜（XPS）、x射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、拉曼光谱、紫外可见光谱、Zeta分析和光谱学等多种技术对CQDs进行了进一步表征。它们主要由碳（71.37%）、氮（3.91%）和氧（24.73%）组成，呈近球形，分布均匀，平均直径为2.7 nm。它们具有许多有趣的特性，如广泛的激发/发射带，激发敏感发射，出色的光稳定性，反应性，热敏性等。一个温度传感器（热敏度为0.58% C−1）具有重复性和可逆性的结果也被证明。此外，它们对水溶液中的离子具有选择性和敏感性。因此，它们也被用作金属离子（Fe3+）传感的荧光探针。当前金属离子传感器的最低检出限为19.1µM/L。

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来源期刊

Carbon Letters CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

7.30

自引率

20.00%

发文量

118

期刊介绍： Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.