Method for quantitative analysis of loads inside and outside carbon nanotube

A method for quantitative analysis of loads inside and outside a carbon nanotube, comprising the following steps:

• S1, pretreatment:
• placing a carbon nanotube loaded with metal catalyst particles in a tube furnace, and vacuuming, wherein the metal catalyst particles are one selected from the group consisting of cobalt, nickel, and copper;
• S2, end-capping:
• annealing the carbon nanotube, wherein an annealing temperature is set to 1,200° C. to 1,500° C.;
• and at beginning of cooling, a carbon source gas is introduced into the tube furnace;
• S3, oxidation and hydrothermal reaction:
• calcining the annealed carbon nanotube obtained in the S2 in atmosphere such that the metal catalyst particles loaded on an outer wall of the carbon nanotube are converted into an oxidation state;
• then placing in a reactor, adding dilute sulfuric acid to the reactor, and heating and stirring such that oxidized metal catalyst particles attached to the outer wall of the carbon nanotube are dissolved to obtain a metal sulfate solution, and an end-capped carbon nanotube having the metal catalyst particles loaded inside;
• S4, detection of a load inside the carbon nanotube:
• determining a load inside the end-capped carbon nanotube obtained in the S3 by inductively coupled plasma mass spectrometry;
• and
• S5, detection of a load outside the carbon nanotube:
• determining a content of the metal catalyst particles in the metal sulfate solution obtained in the S3 by ethylenediaminetetraacetic acid complexometric titration, to obtain the load outside the carbon nanotube.