Nazri Nur Afifah Ahmad, Azeman Nur Hidayah, Bakar Mohd Hafiz Abu, Mobarak Nadhratun Naiim, Luo Yunhan, Arsad Norhana, Aziz Tg Hasnan Tg Abd, Zain Ahmad Rifqi Md, Bakar Ahmad Ashrif A
Department of Electrical, Electronic and Systems Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia.
Department of Chemical Sciences, Faculty of Sciences and Technology, Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia.
Nanomaterials (Basel). 2021 Dec 23;12(1):35. doi: 10.3390/nano12010035.
This paper demonstrates carbon quantum dots (CQDs) with triangular silver nanoparticles (AgNPs) as the sensing materials of localized surface plasmon resonance (LSPR) sensors for chlorophyll detection. The CQDs and AgNPs were prepared by a one-step hydrothermal process and a direct chemical reduction process, respectively. FTIR analysis shows that a CQD consists of NH, OH, and COOH functional groups. The appearance of C=O and NH at 399.5 eV and 529.6 eV in XPS analysis indicates that functional groups are available for adsorption sites for chlorophyll interaction. A AgNP-CQD composite was coated on the glass slide surface using (3-aminopropyl) triethoxysilane (APTES) as a coupling agent and acted as the active sensing layer for chlorophyll detection. In LSPR sensing, the linear response detection for AgNP-CQD demonstrates R = 0.9581 and a sensitivity of 0.80 nm ppm, with a detection limit of 4.71 ppm ranging from 0.2 to 10.0 ppm. Meanwhile, a AgNP shows a linear response of R = 0.1541 and a sensitivity of 0.25 nm ppm, with the detection limit of 52.76 ppm upon exposure to chlorophyll. Based on these results, the AgNP-CQD composite shows a better linearity response and a higher sensitivity than bare AgNPs when exposed to chlorophyll, highlighting the potential of AgNP-CQD as a sensing material in this study.
本文展示了以三角形银纳米颗粒（AgNPs）修饰的碳量子点（CQDs）作为用于叶绿素检测的局域表面等离子体共振（LSPR）传感器的传感材料。CQDs和AgNPs分别通过一步水热法和直接化学还原法制备。傅里叶变换红外光谱（FTIR）分析表明，CQD由NH、OH和COOH官能团组成。X射线光电子能谱（XPS）分析中在399.5 eV和529.6 eV处出现的C=O和NH表明这些官能团可作为叶绿素相互作用的吸附位点。使用（3-氨丙基）三乙氧基硅烷（APTES）作为偶联剂将AgNP-CQD复合材料涂覆在载玻片表面，并用作叶绿素检测的活性传感层。在LSPR传感中，AgNP-CQD的线性响应检测显示R = 0.9581，灵敏度为0.80 nm ppm，在0.2至10.0 ppm范围内的检测限为4.71 ppm。同时，AgNP显示出R = 0.1541的线性响应和0.25 nm ppm的灵敏度，暴露于叶绿素时的检测限为52.76 ppm。基于这些结果，在暴露于叶绿素时，AgNP-CQD复合材料比裸AgNPs表现出更好的线性响应和更高的灵敏度，突出了AgNP-CQD作为本研究中传感材料的潜力。
