Ultrathin Ni-MOF Nanobelts-Derived Composite for High Sensitive Detection of Nitrite

Abstract

In this paper, the Ni/NiO ultrathin nanobelts were successively synthesized by a facile in suit conversion process using pre-synthesized Ni-based metal-organic frameworks (MOFs) nanobelts as parent materials to detect the nitrite (NaNO 2 ). The synthesized Ni/NiO composites have the advantages in structure, as follows: (I) Interleaved 3D reticulated structure has strong mechanical stability; (II) Ultrathin nanobelt structures allow more active sites to be exposed and make the transfer of charge faster; (III) A large number of ultrafine Ni nanoparticles decorate the building blocks of the NiO nanobelt and enhance the electrical conductivity. Ni/NiO/GCE has an obvious oxidation peak at 0.78 V, when the concentration is between 0.5 and 1000 µM, the oxidation peak current of NaNO 2 is linearly related to the concentration, and the sensitivity is 1.5319 µA mM −1 cm −2 (S/N = 3). Moreover, the experimental results also concluded that the Ni/NiO ultrathin nanobelts not only indicated wonderful reproducibility in the determination of NaNO 2 in the pickled pork samples, but also could be well-recovered and keep stable for a long time.Keywords: in suit conversion method, Ni/NiO ultrathin nanobelt, metal nanoparticle, metal organic framework, nitrite

Effect of Micronization on Panax notoginseng: In Vitro Dissolution and In Vivo Bioavailability Evaluations

“…The hydrothermally treated samples (Powder 4) were soaked in water for 5 min at 20, 30, 40, 50, 60, 70, 80, 90, or 100°C, respectively, and then the PNP was prepared by freeze drying. The powders were placed on double-sided adhesive tape on SEM stubs and coated with gold [ 26 , 27 ].…”

On the role of graphene oxide in bifunctional Ni/MOF/rGO composites in electrochemical nitrate detection and oxygen evolution reaction

“…[54][55][56] Among the many porous materials, MOFs and MOF-derived materials can stand out and be excellent choices because (1) they have various pore sizes and shapes to meet the unique requirements of metal nanoparticles; (2) they have high porosity and specific surface areas to carry metal nanoparticles; and (3) understanding catalysis requires precisely defining the MOF structure and making sure that the pore structure is easily tailored to make sure that the surrounding environment is not affected. [54][55][56][57][58][59][60][61][62][63][64][65] The oxygen evolution reaction or OER for short, is a limiting reaction in chemical processes that produce molecular oxygen: oxidation of water during oxygenic photosynthesis, electrolysis of water into oxygen and hydrogen, and electrocatalytic oxygen evolution from oxides and oxoacids. [66][67][68][69][70] The advancement of numerous distinct renewable energy technologies depends on the creation of improved catalysts for the OER.…”

“…53,54 Metal–organic frameworks (MOFs) are anticipated to be crucial in electrochemical sensing applications. 54–56 Among the many porous materials, MOFs and MOF-derived materials can stand out and be excellent choices because (1) they have various pore sizes and shapes to meet the unique requirements of metal nanoparticles; (2) they have high porosity and specific surface areas to carry metal nanoparticles; and (3) understanding catalysis requires precisely defining the MOF structure and making sure that the pore structure is easily tailored to make sure that the surrounding environment is not affected. 54–65…”

Preparation and characterization of a newly constructed multifunctional Co(ii)–organic framework: proton conduction and adsorption of Congo red in aqueous medium

“…Therefore, one of the challenges is to obtain enhanced conductivity at relatively high temperature. During the past few decades, metal-organic frameworks (MOFs) have aroused much interest due to their potential applications such as in adsorption, [11][12][13][14][15] electrocatalysis, [16][17][18][19][20][21][22][23][24][25] drug delivery, 26,27 electrode materials, 28 proton conduction, 10,29,30 luminescence sensing, [31][32][33][34] and energy storage materials 35,36 owing to their crystallinity, relatively large surface area and tunable structures. It was well-documented that the prerequisite for a MOF material to exhibit proton-conducting behavior is to provide hydrogen-bonding sites.…”