Two-dimensional molybdenum disulfide (MoS2) with gold nanoparticles for biosensing of explosives by optical spectroscopy

State of the Art in Alcohol Sensing with 2D Materials

“…The ability to prepare these groups of nanosheets in high yield and large scale via various methods, such as mechanical exfoliation [114], electrochemical lithiation [115], liquid exfoliation with sonication [116], and chemical vapour deposition (CVD) growth [117], has led to increasing studies on their hybridisation with other materials to create novel functional composites, aiming to engineer their chemical, physical, and electronic properties and thus achieve good performance for some specific applications. One of the most popular applications of TMDs is using them as photodetectors, gas sensors, moisture sensors, and biosensors [118][119][120][121][122][123][124]. Among members of this family, sulphides and selenides of Mo and W are the most studied with several investigations on tuning their properties through chemical functionalisation or pairing them with other 2D materials, such as graphene, through van der Waal forces to form what is known as 2D heterostructures [124].…”

Metal Nanoparticles Anchored on Rhenium Disulfide Nanosheets as Catalysts for the Reduction of Aromatic Nitro Compounds

“…These defect sites are advantageous for further surface modification. To date, only a few were reported on the noble metal NPs deposited on 2D TMD nanomaterials . Recently, Qiao et al .…”

Salivary Cortisol Determination on Smartphone-Based Differential Pulse Voltammetry System

“…After that, the layer-by-layer self-assembled sandwich-structured screen-printed electrodes ( Figure 1a) were established by subsequently adding 10 µL gold nanoparticles (AuNPs) to the working electrode with linkage of Au-S bonds between MoS 2 SAM and AuNPs, and the second self-assembled monolayer of AuNPs was formed. The preparation of the latter layer of gold nanoparticles (AuNPs) has been described in the previous papers [14,38]. In short, 100 µL chloroauric acid (HAuCl 4 , 1%) was diluted 10 times with deionized water and heated to 80 • dispersion (MoS2, 1 mg/mL) was dropped evenly onto the working electrode surface and air-dried for about 1 h to form stable Au-S covalent bonds, and an effective self-assembled monolayer (SAM) of MoS2 was created.…”

“…For example, two-dimensional (2D) materials like graphene oxide (GO) sheets [33,34], layered transition metal dichalcogenides (TMDs) have been extensively studied during the past two decades [35]. In particular, molybdenum disulfide (MoS 2 ), a typical member of layered transition-metal dichalcogenide, comprising a metal Mo layer sandwiched between two S layers and stacked together by weak van der Waals interactions, is drawing great attention in the electrochemical field due to its outstanding mechanical, catalytic, optical, and electric transportation properties, just as in the field of optics [36][37][38][39]. The MoS 2 sheet with thiol groups on the surface was employed to chemically combine with noble nanomaterials for the improvement of conductivity, taking advantage of its property of large surface area, so as to be fabricated with biocomponents for biosensors.…”

“…Noble metal nanoparticles possess remarkable properties, such as superior stability, high catalytic activity, simple synthesis process, bio-compatibility and easy storage, which have attracted extensive attention in biosensing electrochemical systems. In addition, combination of nanomaterials and MoS 2 results in large electro-active surface area to volume ratio, accelerated electron transfer from electrode to the modified biomaterial, and low background current, providing a multifunctional sensing platform that combines the best features of the two materials [38,[40][41][42]. Moreover, their immobilization on the disposable screen-printed electrodes offers an excellent option for cortisol detection at point-of-care testing (POCT).…”