Figure 2.
Screen-printed board used for the pH measurement.
Notes: The WE is coated with a graphene oxide layer. The RE is Ag/AgCl.
Abbreviations: CE, counter electrode; RE, reference electrode; WE, working electrode.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.