Au/ZnO hybrid nanocatalysts impregnated in N-doped graphene for simultaneous determination of ascorbic acid, acetaminophen and dopamine

Biomass‐Derived N‐doped Carbon Materials with Silica‐Supported Ultrasmall ZnO Nanoparticles: Robust Catalysts for the Green Synthesis of Benzimidazoles

“…The C1 sX PS peaks of ZnO/SiO 2 -NC-600 ( Figure 6c)s hows that the lower energy peak near 284.52 eV is assignedt og raphitic carbon species or CÀNb onds, the peak centered at about2 85.13 eV is attributed to C=Cb onds, and the higherb inding energy 288.43eVo riginates from CÀCo rC ÀHb onds in undecomposed chitosan. [6,33] The deconvolution of N1senergy-level signals ( Figure 6d)s uggests that ZnO/SiO 2 -NC-600 contains several nitrogen species, including intact NH 2 groups (397.74 eV); pyridinic,p yrrolic,a nd graphitic nitrogen atoms (398.73, 399.72, and 400.70 eV,respectively), and pyridinic N-oxide functions (402.01 eV). [6,[34][35][36] In addition, an N1 ss ignal also appears at 398.13 eV,w hich falls in the range of the binding energies of NÀZn bonds, thus further verifying that interactions be- tween ZnO nanoparticlesa nd the N-doped carbon support exist.…”

Optimization of an Electrochemical Sensor for Determination of Imidacloprid Based on β‐cyclodextrin Electropolymerization on Glassy Carbon Electrode

“…It is observed a reduction peak at −0.96 V associated with the IMP . The aromatic nitro compound present in the IMP structure is reduced to generate a hydroxylamine derivative in a process involving four electrons . The cyclic voltammogram obtained with GCE/β‐CD exhibits a current variation increasing of 947 % in relation to the bare GCE, as shown in Figure b.…”

Can Graphene Bilayers Be the Membrane Mimetic Materials? Ion Channels in Graphene-Based Nanostructures

“…To date, all the exceptions from this reductionistic rule, actually, confirm the rule, since the range of charge, mass and other physical and chemical parameters of the substances used in the composite techniques as well as the degrees of their biochemical (or immunochemical in the case of such detection principles) affinity differ by orders of magnitude: aptamers/nucleic acids [46,47]; conductive polymers, such as polypyrrole (both at graphene and pyrolytic graphite) [48-51]; porphyrins and their derivaives, qualitatively different in their physical and chemical properties and aggregation behavior in solutions [52-54]; aminosugars -linear polysaccharide derivatives, such as chitosan [55, 56] used for immobilization; polymer electrolytic membranes, particularly those based on fluoride containing copolymers -fluorocarbon vinyl esters containing sulfonic groups (e.g. a well known nafion), including those with the composite impregnation by several inorganic components and structure-modifying agents [57-60]; inorganic particles and clusters themselvesgold, copper, nickel and zinc oxide nanoparticles [61][62][63][64][65][66][67][68]; graphene-doping chemical elements, such as nitrogen [69,70]. Although the above list is not complete, it fully represents the range of different mass and charge parameters for a number of molecules in the membrane mimetic structures performing receptor functions based on graphene and its derivatives.…”