A Novel Hydrogen Peroxide Amperometric Sensor based on Thionin Incorporated onto a Mo₆S_9‐xI_x Nanowire Modified Glassy Carbon Electrode

Abstract

A simple and enzymeless amperometric sensor for the detection of H 2 O 2 based on a new kind of nanomaterial Mo 6 S 9Àx I x (MoSI) nanowires (NWs) was developed. The construction of the sensing platform was based on strong electrostatic interactions between negatively charged MoSI NWs and positively charged thionin molecules. MoSI NWs act as not only a good substrate for the immobilization of redox mediator thionin, but also a promoter for electrocatalysis of H 2 O 2 . The fabricated sensor showed a wide linear range over the concentration of H 2 O 2 from 5 mM to 2.8 mM with a measurable lowest detection of 0.8 mM; furthermore, it exhibited good stability and reproducibility. [24] etc. have been used for the immobilization of Th on various electrode materials. These systems were usually divided into two types. One was based on the co-immobilization of horseradish peroxidase and Th on various electrode materials by covalent linking methods [11, 13 -14, 17 -18]. Most of these systems were complicated and time-consuming, involving multistep synthetic procedures; furthermore, the activity of enzymes was easily affected by temperature, pH, humidity and toxic chemicals. The other was based on enzymeless immobilization, and most of them were involved in CNTs, which were used as an immobilization substance due to their high electrical conductivity, high chemical stability, extremely high mechanical strength and large surface area [8 -10, 12,]. Unfortunately, these systems usually could not avoid complex organic synthesis work in order to make Th be immobilized stably on the electrodes. Consequently, to explore and develop a simple, time-saving and reliable strategy using new nanomaterials for the enzymeless immobilization of Th arouses our research interest.Molybdenum-chalcogenide-halide nanowires (NWs) which are composed of molybdenum (Mo), sulfur (S) and iodine (I) in the form of Mo 6 S 9Àx

Simultaneous Determination of Copper, Lead, and Cadmium Ions at a Mo 6 S 9-x I x Nanowires Modified Glassy Carbon Electrode Using Differential Pulse Anodic Stripping Voltammetry

“…Compared to carbon nanotubes, MoSI NWs have some significant advantages such as straight forward synthesis, monodisperse diameters, and metallic properties [28][29][30][31][32][33]. Our preliminary work has demonstrated its application in fabricating novel electrochemical sensors for highly sensitive detection of estrone hapten [34], Hydrogen peroxide [35] and natural double-stranded deoxyribonucleic acid [36]. The results illustrate that MoSI NWs can act as a good sensing platform to construct highly sensitive and effective sensing devices.…”

A novel strategy for immobilization of thionine based on calcium carbonate-gold nanoparticles inorganic hybrid composite and its application in hydrogen peroxide sensor

“…To demonstrate the performance of the developed sensor, a comparison of the current fabricated electrode with those previously reported for H 2 O 2 detection was made and listed in Table 1. It is obvious the proposed sensor showed shorter response time, wider linear range than those of Th-NWs/ GCE [12], TH/MWCNT/Nf/PIGE [37] and enzyme-based biosensors [38,39]. Except HRP/CS/GPTMS/GCE, the developed sensor owned the lowest detection limit.…”

“…Mediated electrochemical sensors also have the advantages of higher sensitivity, lower detection limit, lower operational potential, and less interference from oxidizable species over unmediated sensors. The extensively used electron-shuttling mediators, hexacyanoferrates [6], ferrocene and its derivatives [7], tetrathiafulvalene [8], quininephenylenediimine [9], meldola blue [10], methylene green [11], and thionine (Th) [12], can be used in bulk solution or immobilized on electrode surface. Since mediators added in bulk solution would pollute the sample as well as the counter and reference electrodes, researchers proposed various strategies for immobilization of mediators on underlying substrates.…”

Isolation of Nb2Se9 Molecular Chain from Bulk One-Dimensional Crystal by Liquid Exfoliation

“…LiMo 3 Se 3 has a negative charge on the chain surface due to ionic interactions between Li + ions and Mo 3 Se 3 − chains [17] Mo 6 S 3 I 6 and Mo 6 S 4.5 I 4.5 , on the other hand, undergo vdW interactions and thus dangling bonds exist on their chains, similar to the case in graphene and transition metal dichalcogenides(TMDC). Due to these structural features [11], they have unique physical and chemical properties, which leads to many useful applications such as transistor [12,18,19,20], sensor [21], composite [13] and solar cell [22,23]. In addition, new 1D bulk materials, Sb 2 S 3 [24] and Sb 2 Se 3 [25,26], have been reported to have excellent optoelectronic properties due to the absence of dangling bonds on their chain surfaces.…”