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XPS high resolution C1s spectra of ppNIPAM (top) and spNIPAM (bottom) films after storage in 25°C, low humidity (left) and 37°C low (middle) and high (right) humidity conditions. All surfaces have the bonding environments indicative of pNIPAM deposition, including CH/CC (285 eV), CN/CO (286 eV), and O=CN (288 eV).
