The present invention provides a two-dimensional particle-containing composition and a method for producing the two-dimensional particle-containing composition. [Solution] A two-dimensional particle of a layered material comprising one or more
layers, and a dispersion medium having a
relative permittivity greater than that of water, wherein the one or more
layers are of the following formula: M m X n A two-dimensional particle-containing composition comprising a layer body represented by the formula (wherein M is at least one
metal element M1 of groups 3, 4, 5, 6, or 7 having an
ionization energy higher than Ti, or a combination of
metal element M1 accounting for 50 atomic percent or more of M and
metal element M2 of groups 3, 4, 5, 6, or 7 other than metal element M1 accounting for 50 atomic percent or less of M, X is a
carbon atom, a
nitrogen atom, or a combination thereof, n is between 1 and 4, and m is greater than n and 5 or less), and a predetermined modification or termination T present on the surface of the layer body, wherein the two-dimensional particles have
fluorine and
oxygen elements.