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An efficient and rapid synthesis route to highly fluorescent copper microspheres for the selective and sensitive excitation wavelength-dependent dual-mode sensing of NADH

机译:高效且快速合成的高度荧光铜微球的选择性和敏感激发波长依赖于NADH的双模对抗

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摘要

Fluorescent copper microspheres (CMS) with high quantum yield (72.9 %) were synthesized by an efficient, one-pot, and rapid aggression-induced mechanism. The CMS was bright brick-red luminescent under UV light and have shown an excitation independent emission at 670 run. The emission intensity of CMS was significantly quenched by the addition of nicotinamide adenine dinucleotide (NADH) when excited at 275 nm, providing a linear range with the logarithmic concentration of NADH, suitable for the detection of low concentrations of NADH. Similarly, the emission intensity at 670 nm was enhanced when excited at 340 nm, providing a linear range for NADH determination in the higher concentration. Thus, a dual-mode sensing platform for the determination of NADH was established by utilizing the fluorescent quenching and enhancement properties of NADH over CMS. Addition of other common interfering molecules and ions induced only a meager change in the fluorescent intensity of CMS, suggesting the high selectivity of the sensor. The linear range observed for NADH by exploring the fluorescent quenching properties was from 24.8-575.2 μM (R~2 = 0.99) with a L.O.D of 2.4 μM. Meanwhile, the linear range observed for NADH by utilizing the fluorescent enhancing properties was from 625 HM-2.30 mM (R~2 = 0.98) with a L.O.D of 322.5 μM.
机译:通过高效,一锅和快速侵略诱导的机制合成具有高量子产率(72.9%)的荧光铜微球(CMS)。 CMS在UV光下是明亮的砖红色发光,并在670次运行时显示了激励独立发射。当在275nm激发时,通过加入烟酰胺腺嘌呤二核苷酸(NADH)显着淬灭CMS的发射强度,提供具有NADH的对数浓度的线性范围,适用于检测低浓度的NADH。类似地,当在340nm激发时,增强了670nm的发射强度,为NADH测定的线性范围以较高的浓度为主。因此,通过利用NADH对CMS的荧光猝灭和增强性能来确定用于确定NADH的双模感测平台。添加其他常见的干扰分子和离子仅诱导CMS的荧光强度的微薄变化,表明传感器的高选择性。通过探索荧光猝灭性能观察到NADH的线性范围为24.8-575.2μm(R〜2 = 0.99),L.O.D为2.4μm。同时,通过利用荧光增强性能观察到NADH的线性范围为625hm-2.30mm(R〜2 = 0.98),L.O.D为322.5μm。

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