5,10,15,20-tetrakis (4-carboxylphenyl) porphyrin functionalized NiCo2S4 yolk-shell nanospheres: Excellent peroxidase-like activity, catalytic mechanism and fast cascade colorimetric biosensor for cholesterol

Porphyrin-Modified NiS2 Nanoparticles Anchored on Graphene for the Specific Determination of Cholesterol

“…18,31 As shown in Figure 2e, the peaks at 398.5 and 400.1 eV corresponded to the −NH− and −N bonds of the porphyrin ring, suggesting that porphyrin molecules coexist in the Por-NiS 2 /GO nanocomposites. 23 As presented in Figure 2f, two characteristic peaks at 530.97 and 532.22 eV corresponded to O 1s spin−orbit core levels. 31 Therefore, XPS results verified the successful preparation of Por-NiS 2 /GO nanocomposites, which was consistent with XRD results.…”

“…And the two peaks at 861.3 and 880.0 eV were attributed to the two spin–orbit doublets of Ni with two shake-up satellites based on the Gaussian fitting method. , In Figure c, the peaks at 161.3 and 162.5 eV could be attributed to S 2p 3/2 and S 2p 1/2 , respectively. Furthermore, the peak at 168.47 eV was attributed to the sulfate/sulfite species, owing to the oxidation of S 2– in air. , Figure d shows that the peak centered at a binding energy of 283.92 eV was attributed to a prominent CC peak, and the two minor peaks at 285.01 and 287.5 eV were assigned to CN and CO, respectively. , As shown in Figure e, the peaks at 398.5 and 400.1 eV corresponded to the −NH– and −N bonds of the porphyrin ring, suggesting that porphyrin molecules coexist in the Por-NiS 2 /GO nanocomposites . As presented in Figure f, two characteristic peaks at 530.97 and 532.22 eV corresponded to O 1s spin–orbit core levels .…”

“…To solve the problem of the weak catalytic activity of inorganic nanoparticles, a few organic molecules with a larger conjugate system were used to modify them, including porphyrin, PDI, and phthalocyanines. − Among them, porphyrin was one such kind of organic molecule with four carboxyl groups, and they can be tightly anchored on the surface of inorganic nanoparticles via coordination interactions between the carboxyl groups and metal ions.…”

Preparation of Large Conjugated Polybenzimidazole Fluorescent Materials and Their Application in Metal Ion Detection

“…Using reported method [ 42 , 43 , 44 ], SEM was used to observe the morphology of series CPBIs , as shown in Figure S12 . The surface of CPBI 0 is flat and lamellar.…”

Novel Thermal Decomposition Method for the Synthesis of Iron‐doped SnS2 Nanoparticles and Studies on their Peroxidase‐like Activity

“…Under strong acidic conditions, the amino groups of TMB get protonated and they are not able to donate their lone pair of electrons to the catalyst. [73,74] Thus, the catalytic activity of the catalyst is decreased. When pH > 5, number of OH À ions in the solution increases which leads to decomposition of H 2 O 2 .…”