Search for "colorimetric sensor" in Full Text gives 3 result(s) in Beilstein Journal of Organic Chemistry.
Beilstein J. Org. Chem. 2017, 13, 222–238, doi:10.3762/bjoc.13.25
Beilstein J. Org. Chem. 2011, 7, 218–221, doi:10.3762/bjoc.7.29
Beilstein J. Org. Chem. 2010, 6, No. 32, doi:10.3762/bjoc.6.32