材料科学
墨水池
聚乙烯亚胺
压电
相(物质)
三元运算
光电子学
纳米发生器
响应度
复合材料
纳米技术
有机化学
化学
遗传学
转染
计算机科学
光电探测器
生物
程序设计语言
细胞培养
作者
Hari Krishna Mishra,Arshdeep Kaur Gill,Varun Gupta,Pinki Malik,Tridib Kumar Sinha,Debabrata Patra,Dipankar Mandal
标识
DOI:10.1002/admt.202201350
摘要
Abstract In this study, poly(vinylidene fluoride) (PVDF) nanoparticles (NPs) are fabricated with the preferred electroactive δ‐phase due to the interfacial crystallization at the ternary phase system, i.e., PVDF‐DMF‐water at ambient conditions. Further, the surfaces of PVDF NPs are modified with in situ copolymerized polydopamine‐polyethylenimine (PDA‐PEI) to ensure the well dispersion of poorly dispersive PVDF NPs in water. The piezoresponse force microscopy (PFM) confirms the piezo‐ and ferro‐electric capabilities of PDA‐PEI coated PVDF NPs (i.e., PVDF@f Ink) with an associated phase reversal of Δϕ ≈ 180° upon the application of a very low DC bias voltage that indicates their applicability in low power devices. Additionally, fabricated flexible piezoelectric nanogenerator (f‐PNG) with PVDF@f Ink shows a promising electrical output as a mechanical energy harvester. It also promises the physiological signals detection abilities due to superior mechanoacoustic behavior. Furthermore, f‐PNG has shown excellent photo‐detection and piezo‐phototronic properties. The fast photoresponse of 0.43 s, responsivity of 24 µA W −1 , and specific detectivity ≈1.4 × 10 10 Jones, promises the ideal choice for the optoelectronic devices. Thus, it is expected that the PDA‐PEI coated δ‐phase comprising PVDF NPs can be utilized as a piezoelectric ink for flexible optoelectronic devices.
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