RESUMO
Soft bioelectronic devices provide new opportunities for next-generation implantable devices owing to their soft mechanical nature that leads to minimal tissue damages and immune responses. However, a soft form of the implantable optoelectronic device for optical sensing and retinal stimulation has not been developed yet because of the bulkiness and rigidity of conventional imaging modules and their composing materials. Here, we describe a high-density and hemispherically curved image sensor array that leverages the atomically thin MoS2-graphene heterostructure and strain-releasing device designs. The hemispherically curved image sensor array exhibits infrared blindness and successfully acquires pixelated optical signals. We corroborate the validity of the proposed soft materials and ultrathin device designs through theoretical modeling and finite element analysis. Then, we propose the ultrathin hemispherically curved image sensor array as a promising imaging element in the soft retinal implant. The CurvIS array is applied as a human eye-inspired soft implantable optoelectronic device that can detect optical signals and apply programmed electrical stimulation to optic nerves with minimum mechanical side effects to the retina.
Assuntos
Dissulfetos/química , Desenho de Equipamento/métodos , Grafite/química , Molibdênio/química , Transistores Eletrônicos , Próteses Visuais , Algoritmos , Animais , Desenho de Equipamento/instrumentação , Humanos , Masculino , Modelos Teóricos , Estimulação Luminosa , Ratos Wistar , Retina/fisiologia , Visão Ocular/fisiologiaRESUMO
Large-scale colloidal synthesis and integration of uniform-sized molybdenum disulfide (MoS2 ) nanosheets for a flexible resistive random access memory (RRAM) array are presented. RRAM using MoS2 nanosheets shows a ≈10 000 times higher on/off ratio than that based on exfoliated MoS2 . The good uniformity of the MoS2 nanosheets allows wafer-scale system integration of the RRAM array with pressure sensors and quantum-dot light-emitting diodes.
