PALLADIUM NANODENDRITE-GRAPHENE NANOHYBRID BASED HYDROGEN SENSOR AND METHOD FOR MANUFACTURING SAME

摘要

The present invention relates to a palladium (Pd) nanodendrite-graphene nanohybrid based hydrogen sensor and a method for manufacturing the same. In the present invention, palladium (Pd) nanodendrites (porous Pd nanoshperes) were synthesized by an easy one-stage chemical pathway through a fast reaction process of a Pd precursor salt. Here, in the one-stage reaction, very uniform colloidal Pd dendrites with a size of 60-70 nm were simply reduced to graphene flakes by hydrazine (a reducing agent) in order to form a Pd dendrite graphene hybrid. A resistor type sensor used together with the Pd dendrite graphene had good linearity at room temperature and a detectable range of 1000 ppm to 1 ppm. Furthermore, the hydrogen (H₂) sensor can show a distinctly different reaction even in the low hydrogen (H₂) concentration range of 1 ppm to 10 ppm at a low work temperature of room temperature below 50°C. When compared with our previous invention with respect to the H2 detection on the basis of Pd graphene composite/hybrid, a novel Pd dendrite graphene hybrid has several advantages, such as a higher reaction value, favorable reproducibility, fast reaction/recovering time, and less hysteresis at a low work temperature, excluding a disadvantage, such as the deterioration in the reaction at a high temperature (100°C). From calculation results of hydrogen (H₂) sensing, these advantages result from a high ratio of volume over area and a high porosity of the Pd dendrite nanostructure.