Conjugated Polymer Nanoparticles for the Amplified Detection of Nitro-explosive Picric Acid on Multiple Platforms
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- 作者：Akhtar Hussain Malik ; Sameer Hussain ; Anamika Kalita ; Parameswar Krishnan Iyer
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2015
- 出版时间：December 9, 2015
- 年：2015
- 卷：7
- 期：48
- 页码：26968-26976
- 全文大小：544K
- ISSN：1944-8252
文摘
Spontaneously formed conjugated polymer nanoparticles (CPNs) or polymer dots displayed remarkable fluorescence response toward nitroexplosive-picric acid (PA) in multiple environments including 100% aqueous media, solid support using portable paper strips and vapor phase detection via two terminal device. This new cationic conjugated polyelectrolyte (CPE) poly(3,3鈥?((2-phenyl-9H-fluorene-9,9-diyl)bis(hexane-6,1-diyl))bis(1-methyl-1H-imidazol-3-ium)bromide) (PFMI) was synthesized by Suzuki coupling polymerization followed by post functionalization method without employing any hectic purification technique. Highest quenching constant value (Ksv) of 1.12 脳 108 M鈥? and a very low detection limit of 30.9 pM/7.07 ppt were obtained exclusively for PA in 100% aqueous environment which is rare and unique for any CPE/CPNs. Contact mode detection of PA was also performed using simple, cost-effective and portable fluorescent paper strips for achieving on-site detection. Furthermore, the two terminal sensor device fabricated with nanoparticles of PFMI (PFMI-NPs) provides an exceptional and unprecedented platform for the vapor mode detection of PA under ambient conditions. The mechanism for the ultrasensitivity of PFMI-NPs probe to detect PA is attributed to the 鈥渕olecular-wire effect鈥? electrostatic interaction, photoinduced electron transfer (PET), and possible resonance energy transfer (RET).