“…Under the high-resolution projection electron microscope ( Fig. 1 d), the Ag NPs lattice stripes with a spacing of 0.22 nm, corresponding to the Ag(111) plane of the silver lattice, can be clearly seen [31] . Fig.…”
Section: Resultsmentioning
confidence: 99%
“…It has good optical, biocompatibility and electronic effects, and has important application prospects in many aspects [25] , [26] , [27] , [28] . GO and precious metal based composites are widely used for H 2 O 2 detection due to their good electrical conductivity and electrochemical activity [29] , such as ITO-rGO-AuNPs [30] , Ag@ -MnO 2 /GCE [31] , Pt/Fe 3 O 4 /GO [32] and Cu-hemin-MOFs/3D-rGO [33] . It is found that the deposition of metal and metal oxide on rGO can effectively increase the electrocatalytic ability [34] .…”
“…Under the high-resolution projection electron microscope ( Fig. 1 d), the Ag NPs lattice stripes with a spacing of 0.22 nm, corresponding to the Ag(111) plane of the silver lattice, can be clearly seen [31] . Fig.…”
Section: Resultsmentioning
confidence: 99%
“…It has good optical, biocompatibility and electronic effects, and has important application prospects in many aspects [25] , [26] , [27] , [28] . GO and precious metal based composites are widely used for H 2 O 2 detection due to their good electrical conductivity and electrochemical activity [29] , such as ITO-rGO-AuNPs [30] , Ag@ -MnO 2 /GCE [31] , Pt/Fe 3 O 4 /GO [32] and Cu-hemin-MOFs/3D-rGO [33] . It is found that the deposition of metal and metal oxide on rGO can effectively increase the electrocatalytic ability [34] .…”
“…Recently, a nonenzymatic Ag@δ-MnO 2 /G graphene nanocomposite supported by Ag doped δ-MnO 2 nanorods was reported for the subtle detection of H 2 O 2 . The δ-MnO 2 ’s low electrical conductivity and Ag NP aggregation were improved by the ternary nanocomposite (as shown in Figure 3 A) [ 79 ]. Additionally, δ-MnO 2 /G demonstrated an asymmetrical surface as well as several functional moieties for doping more Ag atoms, hence modifying the NCs electrical properties.…”
Section: Gr-based Ec Sensors For Bioanalytes Detectionmentioning
confidence: 99%
“… ( A ) Schematic representation of the [MnO 6 ] octahedral unit’s fundamental structure ( a ), perfectly aligned [MnO 2 ] nanorods ( b ), Mn vacancies in [MnO 2 ] nanorods ( c ), and Ag doping in [MnO 2 ] nanorods ( d ). Reprinted with permission from [ 79 ]. ( B ) NdFeO 3 fabrication using a mixed oxide method in ( a ), and its molecular structure, and ( b ) modified NdFeO 3 electrodes can be used to detect H 2 O 2 , (c) GCE modification for the detection of H 2 O 2 , Reprinted with permission from [ 87 ].…”
Graphene (GR) has engrossed immense research attention as an emerging carbon material owing to its enthralling electrochemical (EC) and physical properties. Herein, we debate the role of GR-based nanomaterials (NMs) in refining EC sensing performance toward bioanalytes detection. Following the introduction, we briefly discuss the GR fabrication, properties, application as electrode materials, the principle of EC sensing system, and the importance of bioanalytes detection in early disease diagnosis. Along with the brief description of GR-derivatives, simulation, and doping, classification of GR-based EC sensors such as cancer biomarkers, neurotransmitters, DNA sensors, immunosensors, and various other bioanalytes detection is provided. The working mechanism of topical GR-based EC sensors, advantages, and real-time analysis of these along with details of analytical merit of figures for EC sensors are discussed. Last, we have concluded the review by providing some suggestions to overcome the existing downsides of GR-based sensors and future outlook. The advancement of electrochemistry, nanotechnology, and point-of-care (POC) devices could offer the next generation of precise, sensitive, and reliable EC sensors.
“…3,15 One of the graphene derivatives, graphene oxide (GO), has come to the forefront in electrochemical applications during recent years due to its unique two-dimensional structure with the availability of a large number of electrochemically favourable carbon edges, and remarkable mechanical, thermal and electronic properties which hindrance the fouling effect. 9,16,17 Due to π-π interaction, the firm self-stacking tendency of graphene faces the aggregation problem during the synthesis process of reduced graphene oxide (rGO), which decreases its surface area, electrical conductivity and solubility compared to GO. 18,19 Surface modification of the rGO substrate could reduce the aggregation problem.…”
For a happy and healthy life, there should have a balance of flight-to-flight hormones, i.e, adrenaline (AD). The necessity of determination of AD is inevitable for the diagnosis of associated diseases with it. For this purpose, N-doped graphene supported α-Co(OH)2 (denoted as NrGO/α-Co(OH)2) was synthesized via a hydrothermal process, where α-Co(OH)2 acted as an active site and NrGO provided a better defective surface for immobilized α-Co(OH)2 nanoparticles. The as-prepared nanocomposite altered the electronic configuration due to its defective nature, which played an important role to increase the stability, surface area and electron transfer capability. As a result, NrGO/α-Co(OH)2 demonstrated remarkable analytical performances toward AD with a lower limit of detection (14.7nM), wide linear range (0.5-800µM), and good sensitivity (115.983 µA mM−1 cm-2). The CA response time was obtained as 2.2 s. The proposed sensor showed precious selectivity during AD detection in presence of coexisting biomolecules such as DA, AA, UA, TY, 5-HT, and NE, and 50-fold excess of common ions such as Na+, K+, Ca2+, Mn2+, Fe2+, CO32-, and SO42-. Furthermore, it also provided long-term stability, good reproducibility and repeatability with practical feasibility in the urine sample. Importantly, the effect of pH was studied in detail on AD oxidation.
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