Kapton hn polyimide foils

Ondansetron (ODS) hydrochloride, hydrogen peroxide (H2O2), sodium hydroxide (NaOH), hydrazine monohydrate, potassium hexacyanoferrate(II) (K4Fe(CN)6), and branched polyethyleneimine (PEI, Mw ∼ 25 000) were purchased from Sigma-Aldrich (Darmstadt, Germany) and used as received.
Graphene oxide (GO) powder was purchased from Graphenea, Spain and ampicillin (AMP) from Fisher Scientific.
Kapton® HN polyimide foils with a thickness of 125 μm were obtained from DuPont (Circleville, OH, USA).

Metformin hydrochloride, hydrazine hydrate (NH2NH2•H2O), sodium hydroxide (NaOH), chloroacetic acid (Cl-CH2COOH), acetonitrile, potassium dihydrogen phosphate buffer (pH 6)
and sodium dodecyl sulfate (SDS) were obtained from Aldrich. Kapton ® HN polyimide foils (thickness of ~75 µm) were provided by DuPont (Circleville, OH, USA). Graphene oxide (GO) was purchased from Graphitene (UK).

Kapton HN polyimide foils (10 × 10 mm 2 , thickness 125 μm, DuPont) were cleaned with acetone in an ultrasonic water bath for 30 min, followed with isopropanol for 10 min and then dried under a nitrogen flow. The cleaned Kapton foils were modified with gold nanoholes (K/Au NHs) according to recent publications. (30) (link)(31) (link)(32) (link) A monolayer of 980 nm polystyrene beads (Microparticles GmbH) was first deposited on the surface of Kapton by self-assembly. To reduce the size of the particles and isolate them, SF6 and oxygen plasma etching for 11 min was employed (5 mTorr). The samples were coated with 2 nm Ti followed by 40 nm Au at a constant deposition rate of 1 Å s -1 using physical vapor deposition. The beads on top of the Kapton were removed by dissolution in chloroform (overnight). The arrays display holes of an average size of 630 nm and center-to-center spacing of 980 nm.