Amino-functionalized graphene/chitosan composite as an enhanced sensing platform for highly selective detection of Cu2+

Individual and Simultaneous Voltammetric Determination of Cd(II), Cu(II) and Pb(II) Applying Amino Functionalized Fe3O4@Carbon Microspheres Modified Electrode

“…It can be seen from Table that the NH 2 −Fe 3 O 4 @C modified electrode exhibits wider linear response range while with comparable lower detection limit. The better electrochemical performance of NH 2 −Fe 3 O 4 @C electrode can be attributed to its excellent electrical conductivity (as confirmed from the results of CV and EIS), larger active area (calculated by applying the Randles‐Sevick equation) and good adsorption capacity for heavy metal ions . Furthermore, the LOD for Cd(II), Cu(II) and Pb(II) is 23.1, 38.4 and 28.5 nM in this work, which is well below the guideline value of Cd(II), Cu(II) and Pb(II) in drinking water set by World Health Organization (WHO), i. e. 26.7, 31250 and 48.3 nM, respectively.…”

“…Mo et al. adopted −NH 2 functionalized graphene/chitosan composite as an enhanced sensing platform for highly selective detection of Cu(II) . Therefore, optimizing the surface properties of Fe 3 O 4 @C microspheres by amination is preferred for electrochemical detection.…”

Nitrogen Doping of Graphite Oxide with 2,3‐Diaminomaleonitrile: A Study of the Structural, Morphological, and Electrochemical Behavior

“…[ 57,60,61 ] Also, this behavior may be due to protonation of carboxyl groups and amine moieties under acidic conditions, further confirming that amine and carboxyl groups are present on the surface of N‐doped CBM. [ 62 ] In general, the high‐resolution spectra of the C 1 s and N 1 s regions for the GrODAMN material showed signals with a wider FWHM and with a slight reduction in energy, compared with the spectra obtained for the GrO material. In general, N‐doping produces new functional groups, changes the number of chemical bonds, modifying the differential charge on the surface of the material, and removes carbon with sp 3 configuration from graphite.…”

Monodispersed CuSe Sensitized Covalent Organic Framework Photosensitizer with an Enhanced Photodynamic and Photothermal Effect for Cancer Therapy

“…44−46 There were three peaks in the N 1s spectrum. The peak at 402.17 eV was attributed to the CN double bond coordinated with copper ions, 47 and the peak at 399.36 eV was ascribed to the residual amino groups in −NH 2 −Cu 2+ , while the third peak located at 398.12 eV was assigned to the free amino groups (R−NH 2 ). These results demonstrated that most of the imine bonds and residual amino groups were coordinated with copper cations via a coordination bond.…”

“…As shown in Figure a–d, the main peak located at 931.9 eV was attributed to Cu 2+ , and the peak at 54.8 eV was assigned to Se 2– . − There were three peaks in the N 1s spectrum. The peak at 402.17 eV was attributed to the CN double bond coordinated with copper ions, and the peak at 399.36 eV was ascribed to the residual amino groups in −NH 2 –Cu 2+ , while the third peak located at 398.12 eV was assigned to the free amino groups (R–NH 2 ). These results demonstrated that most of the imine bonds and residual amino groups were coordinated with copper cations via a coordination bond. − Additionally, the Cu/Se ratio calculated from the TEM energy dispersive spectroscopy (EDS) result was about 1.…”