Abstract: A light, flexible, and tough thin film having high total light transmittance that can be formed on various three dimensional shapes, and also provides a stably driven tactile sensor, which is an electronic device having the switching function thereof, is provided. The tactile sensor is formed on a polyimide thin film having high total light transmittance, thermal resistance, and a polar component of surface free energy with a specific value, and has a switching device that emits a voltage signal which, through an electronic circuit for controlling noise, stably drives another device. This tactile sensor has a curved or flat surface and has a first electrode, a ferroelectric layer, and a second electrode formed over the polyimide thin film. The switching device as a tactile sensor can drive another device merely by a light touch with a finger, and can be manufactured at a high non-defective rate.

Abstract: A method for producing a ferroelectric polymer element includes: disposing one electrode on a substrate; applying polymer solution in which a polyvinylidene fluoride-based polymer is dissolved in a solvent including an aprotic polar solvent onto the one electrode by forme-based printing; firing the polymer solution to crystallize the polyvinylidene fluoride-based polymer, so that a ferroelectric layer is formed; and disposing the other electrode on the ferroelectric layer.

Abstract: The metal thin film production method of the present invention includes, in the following order, the steps of: preparing a substrate (1) having thereon an underlayer (2) formed of an insulating resin; subjecting a surface of the underlayer (2) to a physical surface treatment for breaking bonds of organic molecules constituting the insulating resin; subjecting the substrate (1) to a heat treatment at a temperature of 200° C. or lower; applying a metal nanoparticle ink to the underlayer (2); and sintering metal nanoparticles contained in the metal nanoparticle ink at a temperature equal to or higher than a glass transition temperature of the underlayer (2). A fused layer (4) having a thickness of 100 nm or less is formed between the underlayer (2) and a metal thin film (3) formed by sintering the metal nanoparticles.

Abstract: The metal thin film production method of the present invention includes, in the following order, the steps of: preparing a substrate (1) having thereon an underlayer (2) formed of an insulating resin; subjecting a surface of the underlayer (2) to a physical surface treatment for breaking bonds of organic molecules constituting the insulating resin; subjecting the substrate (1) to a heat treatment at a temperature of 200° C. or lower; applying a metal nanoparticle ink to the underlayer (2); and sintering metal nanoparticles contained in the metal nanoparticle ink at a temperature equal to or higher than a glass transition temperature of the underlayer (2). A fused layer (4) having a thickness of 100 nm or less is formed between the underlayer (2) and a metal thin film (3) formed by sintering the metal nanoparticles.