Metal-Free 2(3),9(10),16(17),23(24)-Octamethoxyphthalocyanine-Modified Uniform CoSn(OH)₆ Nanocubes: Enhanced Peroxidase-like Activity, Catalytic Mechanism, and Fast Colorimetric Sensing for Cholesterol

Abstract

In this paper, a novel metal-free 2(3),9(10),16(17), 23(24)-octamethoxyphthalocyanine (Pc(OH) 8 ) has been first used to modify CoSn(OH) 6 nanocubes to obtain the Pc(OH) 8 /CoSn(OH) 6 nanocomposites, which possess the enhanced peroxidase-like performances, compared with that of pure CoSn(OH) 6 . Pc(OH) 8 / CoSn(OH) 6 can rapidly accelerate the process of catalytic oxidation of the chromogenic substrate 3,3′,5,5′-tetramethylbenzidine (TMB) by H 2 O 2 in 2 min. The peroxidase-like performance of Pc(OH) 8 / CoSn(OH) 6 is consistent with the Michaelis−Menten kinetics. The catalytic mechanism of Pc(OH) 8 /CoSn(OH) 6 from the generated active species (•OH and •O 2 − ) in the catalytic system has been comprehensively investigated by florescent probe and radical quencher experiments. Based on this, a fast colorimetric sensing platform for H 2 O 2 detection and cholesterol is constructed in the range of 0.4−0.8 mM and 0.1−0.9 mM with a limit of detection (LOD) of 0.0914 mM and 10.7 μM. The contents of total cholesterol in serum samples is monitored satisfactorily and distinguished visually.

An efficient strategy to boost the directed migration of photogenerated holes by introducing phthalocyanine as a hole extraction layer

“…3(b) displays an obvious peak at 399.6 eV (–NH), further affirming the appearance of H 2 Pc(COOH) 8 in CoPi/Pc/Ti-Fe 2 O 3 . 10,21 The successful binding between Ti-Fe 2 O 3 and H 2 Pc(COOH) 8 is also discovered in the XPS spectra of C 1s XPS and N 1s from Pc/Ti-Fe 2 O 3 , as well as the shift of the binding energy in the Fe 2p XPS spectra between Ti-Fe 2 O 3 and Pc/Ti-Fe 2 O 3 . (Fig.…”

“…9 Phthalocyanines as the derivative of porphyrins not only possess the advantages as mentioned above, but also have a larger macrocycle structure and narrower band gap between the HOMO and the LUMO than porphyrins. 10 Additionally, phthalocyanines have also been regarded as a hole-transporting material in perovskite solar cells. 11 Therefore, it could be inferred that the incorporation of phthalocyanines between the semiconductor and the cocatalyst might have a fascinating function of accelerating the directed charge transport in the bulk photoanode.…”

Hg2+ Significantly Enhancing the Peroxidase-Like Activity of H2TCPP/ZnS/CoS Nanoperoxidases by Inducing the Formation of Surface-Cation Defects and Application for the Sensitive and Selective Detection of Hg2+ in the Environment

“…On the basis of the above data and previous reports, H 2 TCPP molecules as excellent photosensitizers can absorb visible light with a characteristic Q band (ca. 420 nm).…”

“…For example, some hard templates, including montmorillonite 24 and SiO 2 , 25 have been employed to disperse inorganic nanoparticles to enhance the corresponding peroxidase-like activity. Another effective strategy is using functional molecules, such as porphyrins, 26 phthalocyanines, 27 and perylene diimide, 28 to modify some inorganic nanomaterials with semiconductivity. Thus, the peroxidase-like activity of modified nanocomposites has been enhanced remarkably, which is ascribed to the synergetic effect from the matching of energy bands of organic molecules and nanoperoxidase.…”

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

“…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.…”