23838
A concentration - dependent scanning tunneling microscopy investigation of the molecular self - assembly at a graphite - solution interface revealed supramolecular motifs , which are in perfect agreement with those obtained by simulations .
 Chemical: graphite
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: graphite