A colorimetric method of analysis for trace amounts of hydrogen peroxide with the use of the nano-properties of molybdenum disulfide

Abstract

Molybdenum disulfide (MoS2) is an emerging material with some unique physical and electronic properties somewhat comparable to those of graphene. It was prepared with the use of a simple hydrothermal process, and has a layered structure similar to that of graphene. Also, it has a peroxidase-like catalytic activity and is able to catalyze the oxidation of the colorless peroxidase substrate, 3,3',5,5'-tetramethylbenzidine (TMB), in the presence of H2O2 to produce a blue product. This reaction used MoS2 as a useful peroxidase, which involved a colorimetric method for trace analysis of H2O2 in water, e.g. lake waters. This method is uncomplicated, inexpensive and highly sensitive for H2O2 in the 0.125-1.75 μM range (LOD: 0.08 μM). It is also quite stable in the presence of many common inorganic and organic potentially interfering compounds, e.g. metal ions as well as amino acids and sugars.

Functionalized Hybridization of 2D Nanomaterials

“…[42] In contrast, various nanosheets can be also synthesized via chemical reactions of special precursors under certain experimental conditions (i.e., the so-called bottom-up technique). [5,43] Alternatively, [5,43] Alternatively,…”

The use of tungsten disulfide dots as highly selective, fluorescent probes for analysis of nitrofurazone

“…The WS 2 dots were synthesized by a simple hydrothermal process similar to the synthesis of MoS 2 in our laboratory [7,11]. Sodium tungstate (Na 2 WO 4 Á 2H 2 O; 0.0625 g) was dissolved in 12.5 mL water, and then 0.1 M HCl was added to adjust the pH to 6.5.…”

“…To date, a number of methods have been developed to prepare TMDC nano-sheets, -tubes and -particles. These methods include liquid exfoliation [8,9], hydrothermal synthesis [10,11], pyrolysis [12], chemical vapor deposition [13] and electrochemical Li-intercalation [14]. TMDCs have a wide variety of mechanical and electronic applications with semiconductors of MoS 2 [15,16], MoSe 2 [17,18], WS 2 [19,20] and WSe 2 [21,22].…”

PB@Co3O4 nanoparticles as both oxidase and peroxidase mimics and their application for colorimetric detection of glutathione

“…1 Therefore, much effort is devoted to producing reliable, simple, and lowcost artificial enzymes as substitutes in practical applications. 12,13 In comparison with natural enzymes, nanomaterial-based enzyme mimics exhibit high stability against harsh reaction conditions. 4,5 Since Fe 3 O 4 nanoparticles (NPs) were found to possess intrinsic peroxidase-like activity, many inorganic nanomaterials such as transition metal NPs, 6,7 noble metal NPs 8,9 and carbon nanomaterials 10,11 were also exploited as enzyme mimics and have demonstrated great promise for various biodetection and biomedical applications.…”