Iontronic dual pressure-humidity sensor based on poly(vinyl alcohol)/phosphoric acid/Ni-Al layered double hydroxide hydrogel@melamine sponge for advanced wearable electronics

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin Pub Date : 2025-02-13 DOI:10.1016/j.materresbull.2025.113357

Vuong Dinh Trung , Weili Zhao , Phuoc-Anh Le , Yinjia Zhang , Yanyan Sun , Jun Natsuki , Jing Tan , Weimin Yang , Toshiaki Natsuki

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Abstract

The development of flexible and compressible multifunctional sensors for integration into artificial intelligence systems represents a critical advancement in next-generation electronics. This study introduces a cost-effective method for fabricating a compressible, humidity-sensitive conductive sponge applied for dual pressure-humidity sensing. The multifunctional sensor is based on novel poly(vinyl alcohol)/phosphoric acid/Ni-Al layered double hydroxide@melamine (PVA/HP/Ni-Al LDH@ME) sponges, developed via a multi-step dip-coating process. It provides two main functions: compressive junction sensing, which detects minute motion due to an increase in conductive pathways under pressure, with gauge factors from 1.08−5.72 over a 0 − 85 % strain range and high sensitivity (0.09−15.37 kPa^–1); and humidity sensing based on moisture-induced potential (∼0.5 V) generated by hydroxyl gradients and water diffusion within its porous structure. The iontronic sensor shows potential for on-site detection of human body deformations, humidity-responsive electronic skin, wearable breathing monitors, as well as dual pressure-humidity energy harvesting, thereby advancing multifunctional wearables for artificial intelligence applications.

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来源期刊

Materials Research Bulletin 工程技术-材料科学：综合

CiteScore

9.80

自引率

5.60%

发文量

372

审稿时长

42 days

期刊介绍： Materials Research Bulletin is an international journal reporting high-impact research on processing-structure-property relationships in functional materials and nanomaterials with interesting electronic, magnetic, optical, thermal, mechanical or catalytic properties. Papers purely on thermodynamics or theoretical calculations (e.g., density functional theory) do not fall within the scope of the journal unless they also demonstrate a clear link to physical properties. Topics covered include functional materials (e.g., dielectrics, pyroelectrics, piezoelectrics, ferroelectrics, relaxors, thermoelectrics, etc.); electrochemistry and solid-state ionics (e.g., photovoltaics, batteries, sensors, and fuel cells); nanomaterials, graphene, and nanocomposites; luminescence and photocatalysis; crystal-structure and defect-structure analysis; novel electronics; non-crystalline solids; flexible electronics; protein-material interactions; and polymeric ion-exchange membranes.