Macromolecular Systems with MSA-Capped CdTe and CdTe/ZnS Core/Shell Quantum Dots as Superselective and Ultrasensitive Optical Sensors for Picric Acid Explosive

Dutta, Priyanka; Saikia, Dilip; Adhikary, Nirab C.; Sarma, Neelotpal Sen

doi:10.1021/acsami.5b07660

Cited by 70 publications

(37 citation statements)

References 42 publications

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“…The NH, OH, and CO bonds were observed at 1570, 3450, and 1737 cm −1 , which are then notably shifted to 1520, 3370, and 1717 cm −1 , respectively, after interaction with TNP. [32] This remarkable variation in ζ values of the sensors confirms the electrostatic interaction between the sensors and TNP. [31] The electrostatic interaction was also confirmed by obtaining the variation presented in Figure 5C.…”

Section: Mechanism Of Tnp Detectionmentioning

confidence: 67%

Multiple Emitting Amphiphilic Conjugated Polythiophenes‐Coated CdTe QDs for Picogram Detection of Trinitrophenol Explosive and Application Using Chitosan Film and Paper‐Based Sensor Coupled with Smartphone

et al. 2018

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Novel multiple emitting amphiphilic conjugated polythiophene‐coated CdTe quantum dots for picogram level determination of the 2,4,6‐trinitrophenol (TNP) explosive are developed. Four biocompatible sensors, cationic polythiophene nanohybrids (CPTQDs), nonionic polythiophene nanohybrids (NPTQDs), anionic polythiophene nanohybrids (APTQDs), and thiophene copolymer nanohybrids (TCPQDs), are designed using an in situ polymerization method, which shows highly enhanced fluorescence intensity and quantum yield (up to 78%). All sensors are investigated for nitroexplosive detection to provide a remarkable fluorescence quenching for TNP and the quenching efficiency reached 96% in the case of TCPQDs. The fluorescence of the sensors are quenched by TNP through inner filter effect, electrostatic, π−π, and hydrogen bonding interactions. Under optimal conditions, the detection limits of CPTQDs, NPTQDs, APTQDs, and TCPQDs are 2.56, 7.23, 4.12, and 0.56 × 10−9 m, respectively, within 60 s. More importantly, portable, cost effective, and simple to use paper strips and chitosan film are successfully applied to visually detect as little as 2.29 pg of TNP. The possibility of utilizing a smartphone with a color‐scanning APP in the determination of TNP is also established. Moreover, the practical application of the developed sensors for TNP detection in tap and river water samples is described with satisfactory recoveries of 98.02−107.50%.

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Section: Mechanism Of Tnp Detectionmentioning

confidence: 67%

Multiple Emitting Amphiphilic Conjugated Polythiophenes‐Coated CdTe QDs for Picogram Detection of Trinitrophenol Explosive and Application Using Chitosan Film and Paper‐Based Sensor Coupled with Smartphone

et al. 2018

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“…2005年美国佛罗里达州立大学Mattoussi课题组 [100] 首先将量子点引入爆炸物检测领域, 开发了基于CdSe-ZnS量子点的爆炸物传感器, 用于TNT的痕量检测, 检出限为 20 ng/mL. 此后, 为了提高检测的特异性和灵敏度, 研究人员一般利用表面修饰和离子掺杂的量子点检测痕量爆炸物 [9,101,102] , 但溶液中的量子点容易团聚沉淀, 稳定性差, 难以器件化, 不便于使用.…”

Section: 量子点是一类无机纳米晶体三维尺寸一般小于unclassified

Electrospun fluorescent nanofibrous membranes for trace explosive detection

Ke¹,

Zhu²,

Ren³

et al. 2019

Sci. Sin.-Chim

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“…Thus, it is very important to effectively monitor and detect PA for social and environmental safety. Recently, different substrates were developed in this regard, such as metal–organic frameworks, polymers, nanomaterials, quantum dots, and carbon dots, though the use of supramolecular gels or self‐assembled materials is still very limited …”

Section: Introductionmentioning

confidence: 99%

Triarylamine‐Cored Dendritic Molecular Gel for Efficient Colorometric, Fluorometric, and Impedometeric Detection of Picric Acid

Mondal

Bairi

Das

et al. 2018

Chemistry A European J

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Detection of nitroaromatics at ultralow concentration is a major security concern in defense, forensics, and environmental science. To this end, a new triarylamine-cored dendritic gelator (OGR) was synthesized, which produced thermoreversible, thixotropic, and fluorescent gels in n-octanol. On gelation, both π-π* transitions and the emission peak of the gelator show redshifts with a 4.5-fold increase of fluorescence intensity in the gel state indicating J-aggregation. The nitrogen lone-pair electrons of OGR make it a donor, and electron transfer occurs to acceptor nitroaromatics causing fluorescence quenching, which is further promoted due to its acidity. The Stern-Volmer rate constants measured for different nitroaromatics showed that it senses picric acid (PA) best. The contact-mode technique with OGR-treated paper strips can allow naked-eye detection of PA under UV light down to 10 m concentration within 30 s. Reusability of the gel is achieved by treating OGR@PA with NaOH solution. Impedance spectroscopic results indicated a decrease of both charge-transport resistance and Warburg impedance on successive addition of PA. The limits of detection of PA determined from fluorescence and impedance measurements match well. Thus, the OGR gel is a reusable, low-cost, specific sensor for PA by naked-eye colorimetric, fluorescence, and impedance techniques.

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Macromolecular Systems with MSA-Capped CdTe and CdTe/ZnS Core/Shell Quantum Dots as Superselective and Ultrasensitive Optical Sensors for Picric Acid Explosive

Cited by 70 publications

References 42 publications

Multiple Emitting Amphiphilic Conjugated Polythiophenes‐Coated CdTe QDs for Picogram Detection of Trinitrophenol Explosive and Application Using Chitosan Film and Paper‐Based Sensor Coupled with Smartphone

Multiple Emitting Amphiphilic Conjugated Polythiophenes‐Coated CdTe QDs for Picogram Detection of Trinitrophenol Explosive and Application Using Chitosan Film and Paper‐Based Sensor Coupled with Smartphone

Electrospun fluorescent nanofibrous membranes for trace explosive detection

Triarylamine‐Cored Dendritic Molecular Gel for Efficient Colorometric, Fluorometric, and Impedometeric Detection of Picric Acid

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