All-Painting Process To Produce Respiration Sensor Using Humidity-Sensitive Nanoparticle Film and Graphite Trace

Abstract

We propose an all-painting process to produce a respiration sensor made from a humiditysensitive nanoparticle (NP) film and a graphite trace. The sensor is fabricated under ambient air with a simple vacuum-free process for green electronics: solely hand-painting on a cellulose acetate film. A humidity-sensitive silica NP film is painted by brush on pencil-trace graphite electrodes. An all-painted humidity sensor using this film shows 10 6 % sensitivity within a 10-93% humidity change. The film is flexible and the humidity sensor operates as a respiration sensor after bending test. We design an all-painted respiration sensor using the humidity sensor

Recent Developments in Printing Flexible and Wearable Sensing Electronics for Healthcare Applications

“…The monitoring of human physiological activities such as pulse rate, hydration/dehydration, temperature, motion, pressure, strain, etc. is of particular interest [ 4 , 15 , 38 , 39 ]. Human breath analysis is also a good source of biomarker detection as it can be used to monitor breathing rate, deep body temperature, alcohol detection for diabetes, and for a range of volatile organic compounds exhaled in the breath [ 40 , 41 , 42 ].…”

“…Graphene was investigated recently for a wide range of sensing applications. An all-painted respiration sensor was produced recently using a film of silica nanoparticles combined with a sensitive graphite layer [ 38 ]. The sensors were produced on a flexible substrate to enable conformal integration onto a non-planar surface of human body.…”

Bio‐Multifunctional Smart Wearable Sensors for Medical Devices

“…Humidity is one of the common contact parameters used to monitor tactile behavior in an artificial medical‐sensing system . Relative humidity (RH), the basic physical quantity of humidity, refers to the ratio of water vapor's partial pressure to saturated vapor pressure at a certain temperature and is used in daily life.…”

Optimization of a Handwriting Method by an Automated Ink Pen for Cost-Effective and Sustainable Sensors

“…For example, Li et al directly wrote with a rollerball pen glucose sensors based on carbon-and sliver-based conductive materials [29]. Kano et al fabricated a flexible respiration sensor to detect relative humidity (RH) by defining graphite electrodes with a pencil and depositing an RH sensitive layer based on silica nanoparticles using a brush pen-sensitive silica NP film [30]. Yu et al designed a skin circuit for biosignal acquisition based on this technology.…”