X-ray photoelectron spectroscopic investigations of modifications in plasmid DNA after interaction with Hg nanoparticles

A new class of fluorescent-dots: long luminescent lifetime bio-dots self-assembled from DNA at low temperatures

“…The wide scan XPS spectra in Fig. 2c show four peaks at 133.5, 284.0, 400.0, and 530.6 eV, which are attributed to P2p, C1s, N1s and O1s respectively for both DNA22 and bio-dots, evidencing that the bio-dots composition is colse to that of DNA. The high-resolution O1s spectrum of the bio-dots also display fours peaks at 530.8, 532.0, 532.6 and 533.2 eV, which are attributed to the PO 4 1− , O = C, O–N23 and O–C bands, respectively.…”

“…The O–N should be generated during the preparation of bio-dots. The high-resolution P2p spectrum of bio-dots exhibits two peaks at 133.2 and 134.3 eV, which are attributed to the 2p3/2 and 2p1/2 bands22, respectively, and are identical to that of DNA. This suggests that the PO 4 1− groups on the backbone of DNA are well retained in the bio-dots.…”

“…The high-resolution O1s spectrum of the bio-dots also display fours peaks at 530.8, 532.0, 532.6 and 533.2 eV, which are attributed to the PO 4 1− , O = C, O–N23 and O–C bands, respectively. It is known that DNA contains PO 4 1− , O = C and O–C while lacking O–N22. The O–N should be generated during the preparation of bio-dots.…”

The DNA strand assisted conductive filament mechanism for improved resistive switching memory

“…Among them, the three peaks at 133.5, 284.0, 400.0 eV are attributed to P 2p, C 1s, N 1s respectively for DNA. [48][49][50] In addition, there is one signal in the high resolution spectrum of Cu 2p with a binding energy of 934.8 eV, which is Cu 2p 3/2 , as presented in Fig. 6b.…”

Amino- and Thiol- Polysilsesquioxane Simultaneously Coating on Poly(p-Phenylenetherephthal Amide) Fibers: Bifunctional Adsorbents for Hg(II)

“…However, the ratio of N to S on the surface of PPTA-AM was not the same as that in the reactant mixture of APTES and MPTES. The binding energies of N 1s showed three peaks of N 1S in PPTA-AM-90–PPTA-AM-30 that appeared at about 399, 400, and 401 eV, which can be assigned to NH 2 (Metwalli et al, 2006; Majumder et al, 2009), amide (Giordani et al, 2009), and the protonated NH 2 adjacent to Si-OH, respectively (Acres et al, 2012). The binding energies of Si 2p that appeared at about 102 and 103 eV indicated there were two types of Si in the polysilsesquioxane structure, which could be assigned to Si–O–Si and Si–OH, respectively (Kropman et al, 1997; Qiao et al, 2015).…”