19876
Herein , chemically crosslinked graphene oxide ( GO ) 3D aerogels with large specific surface areas ( up to 850 m ( 2 ) g ( - 1 ) ) , outstanding mechanical performance ( up to 20 MPa Young ' s modulus , 1 MPa yield strength and 45 J g ( - 1 ) specific energy adsorption ) , and superhigh chemical activity ( toward some reducing gases such as H2 S , HI , and SO2 ) , are fabricated by assembling 2D GO sheets edge - to - edge into uniform , 3D hydrogel networks with subsequent supercritical fluid drying .
 Chemical: graphene oxide; Chemical: H2 S; Chemical: HI; Chemical: SO2
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: graphene oxide; Chemical: H2 S; Chemical: HI; Chemical: SO2