Layer-by-layer assembly-induced triboelectric nanogenerators with high and stable electric outputs in humid environments. (February 2018)

• Record Type: Journal Article
• Authors: Kim, Dojin; Lee, Seokmin; Ko, Yongmin; Kwon, Cheong Hoon; Cho, Jinhan
• Is Part Of: Nano energy. Volume 44(2018)
• Page Start: 228
• Page End: 239
• Publication Date: 2018-02
• Subjects: Triboelectric nanogenerator -- Layer-by-Layer assembly -- Nano-/micro-structure -- Fluorination, Humidity; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2017.12.001
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: We introduce a layer-by-layer (LbL) assembly-induced triboelectric nanogenerator (TENG) with a high and stable electric output under a wide range of humidity conditions. In this study, highly porous (cationic poly(allylamine hydrochloride) (PAH)/anionic poly(acrylic acid) (PAA))n multilayer films were prepared via a pH-controlled electrostatic LbL assembly with a subsequent acid treatment and were used as a mold for the triboelectric poly(dimethylsiloxane) (PDMS) replica. The electrical output of the TENGs composed of a protuberant PDMS plate and Al electrodes significantly increased based on the evolution of the nano-/micro-structured PDMS bumps. Particularly, the protuberant PDMS film molded from the porous (1.5 mg mL −1 PAH/0.5 mg mL −1 PAA)20 multilayers displayed a high open-circuit voltage output of 242 V and a short-circuit current density of 16.2 μA cm −2 under a compressive force of 90 N in a relative humidity (RH) of 20%. When this hierarchical PDMS surface was additionally modified by fluorine self-assembled monolayer, the voltage output and current density of the resultant TENG at the same experimental conditions were increased up to approximately 288 V and 17 μA cm −2, respectively, exhibiting a remarkably high humidity-resistant electrical performance (16% loss of the initial voltage at 80% RH). Graphical abstract: We prepared a layer-by-layer (LbL) assembly-induced triboelectric nanogenerator (TENG) with a high and stable electric output under a wide range of humidity conditions. For this study, pH-controlled polyelectrolyte multilayer films with highly porous structure were used as a mold for PDMS replica. The electric output of the resulting TENGs were significantly increased according to the evolution of nano-/micro-structured PDMS bumps. Highlights: Triboelectric nanogenerator was based on electrostatic LbL-assembly. Electrical performance was modulated by the porosity of multilayer films. PDMS plate with hierarchical surface morphology induced highly humidity-resistant electric performance.