Silver nanoparticles decorated reduced graphene oxide (rGO) SERS sensor for multiple analytes

Naqvi, Tania K.; Srivastava, Alok Kumar; Kulkarni, Mukund G.; Siddiqui, Azher M.; Dwivedi, Prabhat K.

doi:10.1016/j.apsusc.2019.02.026

Cited by 80 publications

(35 citation statements)

References 29 publications

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“…This indicates that expected localized surface Plasmon effect of AgNPr on flat Si might be further enhanced by combining with SiNWs having large surface area to volume ratio. While high surface area of SiNWs could provide space for more AgNPr for generating efficient hotspots that produce better SERS response; the detection levels could be enhanced much as more R6G molecules can also be adsorbed on the SiNWs substrates [14,18]. Besides, the effect of the etching time of the SiNWs on Raman scattering of R6G was systematically investigated as illustrated in Figure 4 (left panel and right panel represents Si/SiNWs composites with AgNPr alone and AgNPr /GO, respectively).…”

Section: Resultsmentioning

confidence: 99%

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Silver nanoprisms/graphene oxide/silicon nanowires composites for R6G surface-enhanced Raman spectroscopy sensor

2020

Biointerface Res Appl Chem

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In this study, Silver nanoprisms/Graphene Oxide/Silicon nanowires (AgNPr/GO/SiNWs) nanocomposites have been fabricated for Surface-Enhanced Raman Spectroscopy (SERS) of Rhodamine 6G (R6G). The SiNWs have been synthesized using the metal-assisted chemical etching method. The surface morphologies of the SiNWs samples have been investigated using scanning electron microscopy. By varying the etching time from 5 to 30 min, the nanowire lengths have been tuned from 2 to 10 µm. While the average nanowire diameter remained unaffected (30-60 nm) with the increase in etching time, increments of nanowires length were found to alter the bundle morphology. The final SERS structure is obtained by depositing the GO layer followed by AgNPr. The obtained SERS sensor exhibited an enhanced efficiency as compared to AgNPr/SiNW matrix. The results demonstrate that a maximum efficiency factor of 6.1×1010 could be achieved with sensor fabricated with 30 min etched SiNWs.

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Section: Resultsmentioning

confidence: 99%

“…The GO possess high chemical stability due to active oxygen sites [17]. The integration of a GO layer in the SERS device has been considered useful for protecting the metal nanoparticles from oxidation [18,19]. Currently, we have tried to evaluate SERS efficiency of AgNPr/GO/SiNWs nanocomposites for different etching times.…”

Section: Introductionmentioning

confidence: 99%

Silver nanoprisms/graphene oxide/silicon nanowires composites for R6G surface-enhanced Raman spectroscopy sensor

2020

Biointerface Res Appl Chem

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“…These properties can be tuned to desired values according to the shape and size of the nanoparticles [111]. Furthermore, graphene oxide/noble metal nanoparticle nanohybrids are able to show SERS in addition to enhanced catalytic activity [112]. Reduced graphene oxide/AuNPs are the most common and utilized nanocomposites, which can be prepared by mixing HAuCl 4 with GO and sodium citrate, followed by reduction using NaBH 4 to form AuNPs while reducing GO to rGO [113,114].…”

Section: Chemical Reduction Methodsmentioning

confidence: 99%

“…Reduced graphene oxide/AuNPs are the most common and utilized nanocomposites, which can be prepared by mixing HAuCl 4 with GO and sodium citrate, followed by reduction using NaBH 4 to form AuNPs while reducing GO to rGO [113,114]. Similarly, instead of using HAuCl 4 , AgNO 3 is used for reduced graphene oxide/AgNPs composite synthesis [112,114]. In a similar way, reduced graphene oxide/platinum nanoparticle or reduced graphene oxide/palladium nanoparticle nanohybrids are formed by mixing graphene oxide with chloroplatinic acid (H 2 PtCl 6 ) or tetrachloropalladic acid (H 2 PdCl 4 ), followed by reduction with ethylene glycol or any other reducing agent.…”

Section: Chemical Reduction Methodsmentioning

confidence: 99%

Graphene Oxide-Based Nanohybrids as Pesticide Biosensors: Latest Developments

Mogha¹

2020

Nanotechnology and the Environment

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Graphene is the most significant two-dimensional nanomaterial with sp 2 hybridized carbon atoms in a honeycomb arrangement with an extremely high surface area, excellent electrical properties, high mechanical strength, and advantageous optical properties and is relatively easy to functionalize and mass produce. Various inorganic nanoparticles incorporated with graphene, such as gold, silver, and palladium nanoparticles are brought into sharp focus due to their catalytic, optical, electronic, and quantized charging/discharging properties. Graphene oxide-based nanohybrids are particularly well suited for biosensing applications and catalysis. Consequently, this area of research has grown to represent one of the largest classes within the scope of materials science and is rapidly becoming a key area in nanoscience and nanotechnology offering significant potential in the development of advanced materials in multiple and diverse applications. Here in this present chapter, synthesis, characterization of graphene oxide, and their nanohybrids are discussed thoroughly with their application in the field of pesticide biosensors. This chapter will help in a further understanding of graphene-based nanohybrids as a biosensing platform for their future applications in a sustainable environment.

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“…In this regard, reduced graphene oxide (rGO) can be an appropriate support matrix owing to its unique characteristics of excellent electrical conductivity, large specific surface area, and good biocompatibility . Thus, if the metal nano‐alloys are supported on the rGO nano‐sheets, the electrochemical efficacy of the material can be sufficiently enhanced to establish the non‐enzymatic electrochemical sensing platform . For example, a new non‐enzymatic electrochemical sensing platform was established based on bimetallic Fe−Pd NPs on the surface of rGO and coupled with portable paper sensor for the early stage diagnosis of glucose in urine .…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Non‐enzymatic Electrochemical Glucose Sensor Based on Pd−Mn Alloy Nanoparticles Supported on Reduced Graphene Oxide

et al. 2020

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Mixed metals alloy nanoparticles supported on carbon nanomaterial are the most attractive candidates for the fabrication of non‐enzymatic electrochemical sensor with enhanced electrochemical performance. In this study, palladium‐manganese alloy nanoparticles supported on reduced graphene oxide (Pd−Mn/rGO) are prepared by a simple reduction protocol. Further, a novel enzyme‐free glucose sensing platform is established based on Pd−Mn/rGO. The successful fabrication of Pd−Mn alloy nanoparticles and their attachment at rGO are thoroughly characterized by various microscopic and spectroscopic techniques such as XRD, Raman, TEM and XPS. The electrochemical activity and sensing features of designed material towards glucose detection are explored by amperometric measurments in 0.1 M NaOH at the working voltage of −0.1 V. Thanks to the newly designed Pd−Mn/rGO nanohybrid for their superior electrorochemical activity towards glucose comprising the admirable sensing features in terms of targeted selectivity, senstivity, two linear parts and good stability. The enhanced electrochemical efficacy of Pd−Mn/rGO electrocatalyst may be credited to the abundant elecrocatalytic active sites formed during the Pd−Mn alloying and the electron transport ability of rGO that augment the electron shuttling phenomenon between the electrode material and targeted analyte.

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Silver nanoparticles decorated reduced graphene oxide (rGO) SERS sensor for multiple analytes

Cited by 80 publications

References 29 publications

Silver nanoprisms/graphene oxide/silicon nanowires composites for R6G surface-enhanced Raman spectroscopy sensor

Silver nanoprisms/graphene oxide/silicon nanowires composites for R6G surface-enhanced Raman spectroscopy sensor

Graphene Oxide-Based Nanohybrids as Pesticide Biosensors: Latest Developments

Fabrication of Non‐enzymatic Electrochemical Glucose Sensor Based on Pd−Mn Alloy Nanoparticles Supported on Reduced Graphene Oxide

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