Unity inova 400 mhz spectrometer

The morphology of the POMs was obtained by scanning electron microscopy using the FEI-SEM system (FEI Helios Nanolab 600i, FEI, Hillsboro, OR, USA) at 5 kV. The surface chemistry was determined by FTIR spectroscopy using the Perkin–Elmer Spectrum GX-spectrophotometer (Thermo, Waltham, MA, USA) with a spectral resolution of 1 cm⁻¹ and scan number of 32. The molecular structure was confirmed by the ²⁹Si NMR technique using the Varian Inc. 400 MHz UNITY INOVA spectrometer (Varian Medical Systems, Palo Alto, CA, USA) at room temperature and magic-angle spinning, resonance frequencies, and 90° pulse length of 5 kHz, 79.5 MHz, and 6.5 µs, respectively. The morphology of the gold nanoparticles on POMs were observed using the FEI Tecnai G2F30 electron microscope (FEI) operating at 200 kV. For the nanoparticle size gauge values, the average of ≥100 particles on the TEM images were taken. The UV–Vis spectra were obtained using the Evolution 201 (Thermo) UV–vis spectrophotometer with 1 cm quartz cuvettes. TGA was conducted using the Mettler TGA/DSC 3+ (Mettler-Toledo, Zurich, Switzerland) from natural temperature to 800 °C at a heating rate of 5 °C min⁻¹ under N₂ atmosphere. EA was performed using the Vario EL Cube (Elementar, Frankfurt, Germany) EA instrument. Inductively coupled plasma (ICP) analysis was performed using the Perkin-Elmer Nexion 300 (Perkin-Elmer, Waltham, MA, USA).