▎ 摘　　要

A leak element based on graphene oxide (GO) membranes is developed using vacuum filtration and the modified Hummer's method. He, Ne, Ar, and Kr leak rates (LRs) through the element are measured using a quadrupole mass spectrometer. The various gases undergo molecular flow through the leak element at pressures of up to 500 kPa with the nanoporous structures of GO. The LRs of various gases at particular pressures can be predicted given the LR of one gas at a specific pressure. When the membrane is less than 600 nm thick, the main gas-permeation pathways are aligned defects through the GO membrane and the LR decreases exponentially as the membrane thickness increases. By contrast, when the membrane is more than 600 nm thick, the main gas-permeation pathways are spaces between the layers and the LR is inversely proportional to the membrane thickness. Published by the AVS.