S1 Modular Engineering of H-bonded Supramolecular Polymers for Reversible Functionalization of Carbon Nanotubes Anna Llanes-Pallas, † K. Yoosaf, ¥ Hassan Traboulsi, ‡ John Mohanraj, ¥ Thomas Seldrum, # Jacques Dumont, # Andrea Minoia, § Roberto Lazzaroni,* § Nicola Armaroli,* ¥ and Davide Bonifazi.* ,†,‡ EXPERIMENTAL SECTION Photophysical Characterization. The stock solutions were prepared by dissolving the purified MWCNTs•[X•Y] n in 10 ml of CHCl 3 . The samples for photophysical measurements were prepared by injecting microliter quantities (~50 µl) of this solution into 3 ml of CHCl 3 . Electronic absorption and emission spectra were recorded, respectively, on a Lambda 950 UV/VIS/NIR spectrophotometer (Perkin Elmer) and on a Edinburgh FLS920 spectrofluorimeter (continuous 450 W Xe lamp), equipped with a Peltier-cooled Hamamatsu R928 photomultiplier tube (185-850 nm). Fluorescence lifetimes were measured with an IBH 5000F time-correlated single-photon counting device, by using pulsed NanoLED excitation source (331 nm). Analysis of the luminescence decay profiles against time was accomplished with the Decay Analysis Software DAS6 provided by the manufacturer. Emission quantum yields were determined according to the approach described by Demas and Crosby using Quinine sulfate (Φ em = 0.546 in air-equilibrated acid water solution, 1 N H 2 SO 4 ) 38 as standard. The temperature of the solutions was varied with HAAKE F3-C digital heated/refrigerated water bath (Haake Mess-Technik GmbH u.Co., Germany) which can be manually connected to cuvette holder and controlled externally. All the solvents (CHCl 3 , DMSO, MeOH) are spectroscopic grade Carlo Erba, (99.8 %) and were used as received. X-ray Photoelectron Spectroscopy (XPS). Studies were performed to investigate the chemical composition of the functionalized MWCNT. For each analysis, 2 mg of material was deposited on a copper thin film, which was then fixed on an XPS sample holder using a double side adhesive conductive carbon tap (SPI supplies). For each compound, the analyses were performed on three different spots using ESCA SPECTROMETER where the photon source was a monochromatised Al Kα line (hν = 1486.6 ev) applied with a takeoff angle of 35°. The survey