材料科学
纳米纤维
静电纺丝
光探测
纳米技术
光电子学
钛酸钡
纳米线
钙钛矿(结构)
纳米发生器
氧化铟锡
纳米颗粒
光电探测器
薄膜
压电
化学工程
复合材料
聚合物
电介质
工程类
作者
Sushmitha Veeralingam,Ajay Narayan Konda Ravindranath,Sushmee Badhulika
标识
DOI:10.1002/admi.202000568
摘要
Abstract In this work, a flexible, low cost, and cleanroom‐free technique to fabricate barium titanate (BaTiO 3 ) hybrid p–n homojunction‐based multifunctional sensor for photodetection, strain sensing, and chemiresistive sensing is reported. The n‐type BaTiO 3 nanofibers are synthesized using electrospinning technique and deposited on the flexible indium tin oxide (ITO) using spin‐coating method while p‐type BaTiO 3 nanoparticles are synthesized using modified sol–gel method and deposited using drop‐casting method. Detailed characterization studies are performed to reveal the formation of tetragonal phase p‐type nanoparticles and n‐type nanofibers of BaTiO 3 assembled on the ITO substrate. The fabricated hybrid junction photodetector displays an excellent external quantum efficiency of ≈3500 and photoresponsivity of ≈11 A W −1 . Further, the hybrid junction when employed as strain sensor exhibits a gauge factor of 14 and when operated in chemiresistive sensing mode can detect α1‐acid glycoprotein with an excellent sensitivity of 49.7 µ m −1 in the wide dynamic range of 0.05–10 × 10 –6 m and detection limit of 12 × 10 –9 m . Detailed studies to understand the underlying mechanism of operation for each application are done. The strategy outlined here can be further employed for sensing various physical and chemical stimuli, paving a new path for developing flexible multifunctional nanoelectronic devices.
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