▎ 摘　　要

NOVELTY - The target surfaces comprise MALDI mass spectrometry plate comprising a graphene layer formed on the base plate. The base plate is a copper substrate, a nickel substrate, an silicon dioxide substrate, or stainless steel (SUS). USE - Target surfaces for MALDI mass spectrometry using graphene films. ADVANTAGE - The target surfaces have very important effect on the experimental results according to the type of sample. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a target surfaces. Graphene target plate (10) Laser-irradiated region (20) Sensor (30) Control unit (40)