Fig. 4From: ARGET–ATRP Synthesis and Characterization of PNIPAAm Brushes for Quantitative Cell Detachment StudiesTime-of-flight secondary ion mass spectroscopy positive ion spectra of (a) ARGET–ATRP grafted PNIPAAm brush formed using ascorbic acid as a reducing agent, and (b) spin coated PNIPAAm on silicon substratesBack to article page