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SEM and TEM analysis (Figure 1a) revealed that Ade-Cu was in a granular form. The particle size statistics (Figure 1d) indicated that its average particle size was 42 ± 8 nm. Zeta potential testing (Figure 1e) showed that the material surface carried a strong positive charge (+26.3 ± 0.4 mV), which was conducive to stable dispersion in water. The EDS surface scan spectrum (Figure 1c) and XPS full spectrum (Figure 1f) both confirmed that Ade-Cu was composed of five elements: C, N, O, P, and Cu, and was evenly distributed. The high-resolution Cu 2p XPS spectrum (Figure 1g) showed that the binding energy peaks were located at 934.6 eV (Cu2+ 2p3/2), 954.3 eV (Cu2+ 2p1/2), 932.2 eV (Cu+ 2p3/2), and 951.7 eV (Cu+ 2p1/2), indicating that copper in Ade-Cu existed in a mixed valence state of Cu+/Cu2+. FTIR analysis (Figure 1h) revealed that the material exhibited a characteristic stretching vibration peak of phosphate groups at 1060 cm-1, and retained the C=C/C=N vibration peak of the adenine skeleton at 1650 cm-1. The XRD spectrum (Figure 1i) further indicated that Ade-Cu presented an amorphous structure.
Original link:https://www.sciencedirect.com/science/article/pii/S1385894726008338?sessionid=
