▎ 摘　　要

NOVELTY - Preparation of laser transfer printing graphene oxide humidity sensor involves (1) dissolving commercial graphene oxide powder in deionized water, ethanol and ethylene glycol, configuring as graphene oxide ink, preparing graphene oxide film on transparent glass slide using graphene oxide ink, preparing metal thin film on transparent glass slide using commercial metal ink or metal paste by spin coating or blade coating, mounting substrate on laser processing device platform, mounting transparent slides above substrate, facing graphene oxide film and metal film substrate, controlling laser scanning of metal film on transparent glass slide by computer program, obtaining transfer printing of metal interdigital electrodes on substrate, performing direct laser scanning, sintering and solidifying, controlling laser scanning of graphene oxide film on transparent glass slide, performing direct laser scanning of transfer printed graphene oxide, and evaporating graphene oxide solvent. USE - Preparation of laser transfer printing graphene oxide humidity sensor. ADVANTAGE - The preparation method is flexible and controllable, has high processing precision and efficiency, and produces humidity sensor on hard or flexible substrate by laser transfer printing process in one step. The method improves the performance of humidity sensor. DETAILED DESCRIPTION - Preparation of laser transfer printing graphene oxide humidity sensor involves (1) dissolving commercial graphene oxide powder in deionized water, ethanol and ethylene glycol mixed solution, ultrasonically processing for 30-60 minutes, configuring as graphene oxide ink with concentration of 2-10 mg/mL, (2) preparing a graphene oxide film with a thickness of 10-30 mu m on a transparent glass slide using the graphene oxide ink obtained in step (1), (3) preparing a metal thin film with a thickness of 10-30 mu m on a transparent glass slide using a commercial metal ink or a metal paste by spin coating or blade coating, (4) mounting substrate on laser processing device platform, mounting the transparent slides prepared in steps (2) and (3) above the substrate, facing graphene oxide film and metal film the substrate, adjusting distance between the substrate and the transparent slide to 50-300 mu m, (5) controlling laser scanning of the metal film on the transparent glass slide by a computer program, adjusting laser pulse energy to 1-50 mu J, spot diameter to 5-30 mu m, repetition frequency to 500-2000 Hz and scanning speed 5-30 mm/second, absorbing energy by laser irradiated area to form bubbles to push unvaporized metal towards the substrate, obtaining transfer printing of metal interdigital electrodes on the substrate, (6) performing direct laser scanning step (5) transfer printed metal interdigital electrode, adjusting laser pulse energy to 1-10 mu J, spot diameter to 5-30 mu m, repetition frequency to 1-2 Hz and scanning speed 5-30 mm/second, sintering and solidifying metal interdigital electrodes, (7) controlling laser scanning of the graphene oxide film on the transparent glass slide, adjusting laser pulse energy to 1-10 mu J, spot diameter to 5-30 mu m, repetition frequency to 1-2 Hz and scanning speed 5-30 mm/second, absorbing energy by laser irradiated area to form bubbles to push ungasified graphene oxide toward the substrate, (8) performing direct laser scanning step (7) transfer printed graphene oxide, adjusting laser pulse energy to 1-10 mu J, spot diameter to 5-30 mu m, repetition frequency to 1-2 Hz and scanning speed 5-30 mm/second, and evaporating graphene oxide solvent.