由于农业用途,毒死蜱(CPS)广泛存在于食物和水源中,带来健康和环境风险。因此,这项工作介绍了一种银纳米粒子嵌入纳米锆基金属有机骨架(UiO-66-NH2@AgNPs)的荧光传感器设计,用于准确检查CPS。简而言之,UiO-66-NH2是水热合成的,由于配体到金属的电荷转移(LMCT)而表现出弱的发光。这里,它限制了其在基于荧光的检测中的直接效用。为了解决这个限制,将银纳米粒子(AgNPs)引入UiO-66-NH2,通过金属增强荧光(MEF)效应增强荧光。简而言之,全面的光谱分析,如XPS,SEM,TEM,PXRD,等。,进行以验证UiO-66-NH2@AgNP的合成。随后的评估表明,CPS通过静态猝灭机制有效地猝灭了UiO-66-NH2@AgNPs的发光强度。荧光强度与CPS浓度在10~1,000ng/mL范围内呈良好的线性关系,识别限为191.5ng/mL(S/N=3)。相互作用涉及Ag-S键的形成和静电相互作用,降低荧光强度。该方法通过成功检测水果样品中的CPS得到证实。UiO-66-NH2@AgNPs纳米探针提供了一个简单的,敏感,和精确的CPS传感平台,具有未来用于检测水果和蔬菜中的CPS的潜力。
Chlorpyrifos (CPS) is widely found in food and water sources due to agricultural use, posing health and environmental risks. Therefore, this work introduces a fluorescent sensor design of silver nanoparticle-embedded nano zirconium-based metal-organic frameworks (UiO-66-NH2@AgNPs) for accurate examination of CPS. Briefly, UiO-66-NH2 was synthesized hydrothermally, exhibiting weak luminescence owed to ligand-to-metal charge transfer (LMCT). Here, it limits its direct utility in fluorescence-based detection. To address this limitation, silver nanoparticles (AgNPs) were introduced into UiO-66-NH2, enhancing fluorescence via the metal-enhanced fluorescence (MEF) effect. Briefly, a comprehensive spectral analysis such as XPS, SEM, TEM, PXRD, etc., was performed to validate the synthesis of UiO-66-NH2@AgNPs. Subsequent evaluation revealed that CPS effectively quenched the luminescence intensity of UiO-66-NH2@AgNPs through a static quenching mechanism. The fluorescence intensity exhibited good linearity with CPS concentration in the span of 10 to 1,000 ng/mL, with a recognition limit of 191.5 ng/mL(S/N = 3). The interaction involved Ag-S bond formation and electrostatic interactions, reducing fluorescence intensity. The method was confirmed through successful CPS detection in fruit samples. The UiO-66-NH2@AgNPs nanoprobe offers a simple, sensitive, and accurate platform for CPS sensing, with potential for future use in detecting CPS in fruits and vegetables.