Increase in Electrical Conductivity of MOF to Billion-Fold upon Filling the Nanochannels with Conducting Polymer

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• 作者：Barun Dhara ; Sanjog S. Nagarkar ; Jitender Kumar ; Vikash Kumar ; Plawan Kumar Jha ; Sujit K. Ghosh ; Sunil Nair ; Nirmalya Ballav
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2016
• 出版时间：August 4, 2016
• 年：2016
• 卷：7
• 期：15
• 页码：2945-2950
• 全文大小：481K
• 年卷期：0
• ISSN：1948-7185

文摘

Redox-active pyrrole (Py) monomers were intercalated into 1D nanochannels of [Cd(NDC)_0.5(PCA)]·G_x (H₂NDC = 2,6-napthalenedicarboxylic acid, HPCA = 4-pyridinecarboxylic acid, G = guest molecules) (1) – a fluorescent 3D MOF (λ_em = 385 nm). Subsequent activation of 1⊃Py upon immersing into iodine (I₂) solution resulted in an increment of the bulk electrical conductivity by ∼9 orders of magnitude. The unusual increase in conductivity was attributed to the formation of highly oriented and conducting polypyrrole (PPy) chains inside 1D nanochannels and specific host–guest interaction in 1⊃PPy thereof. The Hall-effect measurements suggested 1⊃PPy to be an n-type semiconductor material with remarkably high-carrier density (η) of ∼1.5 × 10¹⁷ cm^–3 and mobility (μ) of ∼8.15 cm² V^–1 s^–1. The fluorescence property of 1 was almost retained in 1⊃PPy with concomitant exciplex-type emission at higher wavelength (λ_em = 520 nm). The here-presented results on [MOF⊃Conducting Polymer] systems in general will serve as a prototype experiment toward rational design for the development of highly conductive yet fluorescent MOF-based materials for various optoelectronic applications.