Nonlinear Optics to Glucose Sensing: Multifunctional Nitrogen and Boron Doped Carbon Dots with Solid‐State Fluorescence in Nanoporous Silica Films,Particle & Particle Systems Characterization

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Nonlinear Optics to Glucose Sensing: Multifunctional Nitrogen and Boron Doped Carbon Dots with Solid‐State Fluorescence in Nanoporous Silica Films
Particle & Particle Systems Characterization ( IF 2.7 ) Pub Date : 2020-05-17 , DOI: 10.1002/ppsc.202000093
Wycliffe Kiprop Kipnusu ₁ , Carlos Doñate‐Buendía ₁ , Mercedes Fernández‐Alonso ₁ , Jesús Lancis ₁ , Gladys Mínguez‐Vega ₁

Affiliation

DOI: ./ppsc. tunable photoluminescence (PL), as well as cheap and readily available precursor sources. Consequently, CQDs now occupy many frontiers of nanotechnology. Nevertheless, several challenges that hinder their full exploitation still exist, for instance, there is minimum degree of control of optical properties and morphologies during their formation. Additionally, CQDs produced from mixtures of starting precursor materials pose impurity problems to their specific applications. Furthermore, aggregation induced PL quenching of CQDs has limited their highly desired applications in the solid state. This is because in colloidal state, nature of solvent media and PH easily influence optical properties of CQDs,[] which is unwarranted for their function as bio/chemical sensors. Herein, we present facile synthesis of multifunctional CQDs by femtosecond laser ablation of single precursor molecules in solution with feasibility of in situ monitoring and their incorporation into mesoporous silica films for solid-state applications. Fast and easy preparation of CQDs with high purity and high fluorescence (FL) quantum yield (QY) is essential for their applications in bio/chemical sensing. In this article, emphasis is on versatile CQDs that are capable of sensing glucose molecules among other applications. Most glucose sensors are based on electrochemical technique[] with recent studies emphasizing non-enzymatic electrochemical glucose sensing.[–] Detection of glucose from FL signal of CQDs is also an active area of research. Because of its superior sensitivity, FLbased glucose sensing has great potential for ultimate design of non-invasive detection of glucose in biological fluids such as tears, sweat, and saliva where glucose concentration is about one order of magnitude lower than in blood. Non-invasive glucose sensing would be a boon to diabetic patients struggling with finger pricking method. Boronic acids are promising molecules for non-enzymatic FL detection of glucose because they form sensitive and specific reversible covalent complexes with , diols of glucose molecules. To obtain boronic acid doped CQDs, we employed femtosecond (fs) pulsed laser ablation of -aminopyrimidine--boronic acid (-APBA) in solution in a one step process without Multifunctional triple color photoluminescent (PL) nitrogen–boron doped carbon quantum dots (CQDs) with high quantum yield (QY) of % are fabricated by one step femtosecond pulsed laser irradiation of a single precursor (-aminopyrimidine--boronic acid) in solution. In situ generated non-linear and linear emissions are used to monitor CQDs formation which results in enhanced second harmonic generation, two photon absorption (PA), and linear fluorescence; implying triple mode emission. These CQDs present blue, green, and possible red color rendering which are mostly independent to the respective excitation wavelengths ( ) with large stokes shift of nm. Solidλ

中文翻译：

葡萄糖传感的非线性光学：纳米多孔二氧化硅薄膜中具有固态荧光的多功能氮和硼掺杂碳点

DOI：./ppsc. 可调光致发光（PL），以及廉价且容易获得的前体来源。因此，CQD 现在占据了纳米技术的许多前沿。尽管如此，仍然存在一些阻碍其充分利用的挑战，例如，在其形成过程中对光学特性和形态的控制程度最低。此外，由起始前体材料的混合物生产的 CQD 对其特定应用造成了杂质问题。此外，聚集诱导的 CQD 的 PL 猝灭限制了它们在固态下的高度理想的应用。这是因为在胶体状态下，溶剂介质的性质和 PH 很容易影响 CQD 的光学性质，[] 这对于它们作为生物/化学传感器的功能是没有根据的。在此处，我们提出了通过飞秒激光烧蚀溶液中的单个前体分子轻松合成多功能 CQD，具有原位监测的可行性，并将其结合到用于固态应用的介孔二氧化硅薄膜中。快速简便地制备具有高纯度和高荧光 (FL) 量子产率 (QY) 的 CQD 对于其在生物/化学传感中的应用至关重要。在本文中，重点是能够在其他应用中感应葡萄糖分子的多功能 CQD。大多数葡萄糖传感器基于电化学技术[]，最近的研究强调非酶电化学葡萄糖传感。[–] 从 CQD 的 FL 信号检测葡萄糖也是一个活跃的研究领域。由于其卓越的灵敏度，基于 FL 的葡萄糖传感在最终设计非侵入性检测生物体液（如眼泪、汗液和唾液）中的葡萄糖方面具有巨大潜力，其中葡萄糖浓度比血液中的浓度低一个数量级。非侵入性葡萄糖传感对于挣扎于手指刺痛方法的糖尿病患者来说将是一个福音。硼酸是用于非酶促 FL 检测葡萄糖的有前途的分子，因为它们与葡萄糖分子的, 二醇形成灵敏且特异的可逆共价复合物。为了获得硼酸掺杂的 CQD，我们采用飞秒 (fs) 脉冲激光烧蚀溶液中的-氨基嘧啶--硼酸 (-APBA) 一步法，没有多功能三色光致发光 (PL) 氮硼掺杂碳量子点 (CQD) % 的量子产率 (QY) 是通过对溶液中的单一前体（-氨基嘧啶--硼酸）进行一步飞秒脉冲激光照射来制造的。原位产生的非线性和线性发射用于监测 CQDs 的形成，这导致增强的二次谐波产生、双光子吸收 (PA) 和线性荧光；暗示三模发射。这些 CQD 呈现蓝色、绿色和可能的红色显色性，它们大多与各自的激发波长 ( ) 无关，具有 nm 的大斯托克斯位移。固体λ 和可能的红色显色性，它们大多与各自的激发波长 ( ) 无关，具有 nm 的大斯托克斯位移。固体λ 和可能的红色显色性，它们大多与各自的激发波长 ( ) 无关，具有 nm 的大斯托克斯位移。固体λ

更新日期：2020-05-17

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