Eco-friendly carbon quantum dots as a bi-functional fluorescent probe for Cr (VI) detection and optical thermometry

被引：2
作者：
Kumar, Avinash [1 ]
Ritu [1 ]
Kumar, Ishant [1 ,2 ]
Kumar, Sandeep [1 ]
Gathania, Arvind K. [1 ]
机构：
[1] Natl Inst Technol Hamirpur, Dept Phys & Photon Sci, Hamirpur 177005, HP, India
[2] Rabindranath Tagore Govt Coll Sarkaghat, Sarkaghat 175024, HP, India
来源：
MATERIALS RESEARCH BULLETIN | 2025年 / 187卷
关键词：
Carbon quantum dot; Green synthesis; Hydrothermal; Sensor; GREEN SYNTHESIS; PHOTOLUMINESCENCE; TEMPERATURE; NANODOTS; SENSORS; WASTE; ROUTE; JUICE; PH;
D O I：
10.1016/j.materresbull.2025.113394
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Carbon quantum dots (CQDs) from cumin (Cuminum cyminum) seeds have been synthesized using the hydro- thermal technique and were characterized by HR-TEM, XPS, FTIR, RAMAN, UV-Vis, and Photoluminescence (PL) spectroscopy. The photostability of CQDs was investigated through various tests such as in high saline conditions, with their storage time, under UV and white light exposure, pH values, and different solvents. They were found selective and sensitive to Cr6+ ions, so their potential as a fluorescent probe for Cr6+ ions sensing is being studied. The Lowest limit of detection (LOD) value for the current ion sensor in an aqueous solution is 8.3 mu M. The temperature dependence of PL intensity has also been utilized to demonstrate a temperature sensor with a thermal sensitivity of 0.658 degrees C-1. This study contributes significantly to temperature sensing and metal ions detection technologies by utilizing CQDs synthesized from natural precursors.
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页数：16
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