Shape and size controlled synthesis of Au nanorods: H 2 S gas-sensing characterizations and antibacterial application

Lanh, Le Thi; Hòa, Trần Thái; Cuong, Nguyen Duc; Khiếu, Đinh Quang; Quang, Duong Tuan; Duy, Nguyễn Văn; Hòa, Nguyễn Đức; Hieu, Nguyen Van

doi:10.1016/j.jallcom.2015.02.146

Cited by 31 publications

(15 citation statements)

References 35 publications

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“…25 Gold nanorods (GNRs) are rod-shape nanoparticles that could easily be produced with different aspect ratios (dimensions) and therefore different plasmonic properties. 26,27 Due to their shapes, less agglomeration at the immobilized surface is usually achieved. Additionally, their unique optical and physical properties have allowed them to be used for the development of bio-sensing platforms.…”

Section: -24mentioning

confidence: 99%

Impedimetric detection of pathogenic bacteria with bacteriophages using gold nanorod deposited graphite electrodes

et al. 2016

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Electrochemical impedance spectroscopy (EIS) is applied for the detection of bacteria using bacteriophages as a bioprobe together with gold nanorods (GNRs). Escherichia coli -E. coli K12 was used as a model target bacteria and also for the propagation of its specific T4-phages. Gold nanorods (GNRs) were synthesized via a two-step protocol and characterized using different techniques. EIS measurements were conducted in an electrochemical cell consisting of a three electrode system. Single-use pencil graphite electrodes (PGE) were modified by the physical adsorption of GNRs to increase their interfacial conductivity and therefore sensitivity for impedimetric measurements. Therefore, interfacial charge-transfer resistance values (R ct ) sharply decreased after GNRs deposition. Phages were adsorbed on these electrodes via a simple incubation protocol at room temperature, which resulted in an increase in R ct values, which was concluded to be as a result of nonconductive phage layers. These phage-carrying GNRs-PGEs were used for impedimetric detection of the target bacteria, E. coli. Significant increases at the R ct values were observed which were attributed to the insulation effects of the adsorbed bacterial layers. This increase was even more when the bacterial concentrations were higher. In the case of the non-target bacteria Staphylococcus aureus (S. aureus), conductivity noticeable decreases (due to nonspecific adsorption).However, in the case of E. coli, the R ct value increase is time dependent and reaches maximum in about 25-30 min, then decreases gradually as a result of bacterial lysis due to phage invasion on the electrode surfaces. In contrast, there were no time dependent changes with the non-target bacteria S. aureus (no infection and no lytic activity). It is concluded that the target bacteria could be detected using this very simple and inexpensive detection protocol with a minimum detection limit of 10 3 CFU mL À1 in approximately 100 mL bacterial suspension.

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Section: -24mentioning

confidence: 99%

Impedimetric detection of pathogenic bacteria with bacteriophages using gold nanorod deposited graphite electrodes

et al. 2016

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“…Recently the improved surface reactivity of TiO 2 systems has been reported, where the nanowires, nanorods and nanotubes have been used [14][15][16]. One of the main features of these nanostructures is the large specific surface area that makes them attractive for use as the sensitive films for gas sensors, which can improve the gas sensitive performance effectively.…”

Section: Introductionmentioning

confidence: 99%

A fast response and recovery H2S gas sensor based on free-standing TiO2 nanotube array films prepared by one-step anodization method

Tong

Shen

Chen

et al. 2017

Ceramics International

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Free-standing TiNT array film was successfully synthesized by a one-step anodization method. The characteristic techniques including scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD) were adopted to characterize the morphology and chemical composition of the TiNT array film. Subsequently, gas sensor based on the TiNT array film was fabricated and its sensing performance toward H 2 S was investigated. The results showed that the optimum operating temperature to detect H 2 S gas was 300℃, the detection range to H 2 S gas was 1-50 ppm with the response value of 4.5-26.2, and a *Manuscript Click here to view linked References good linearity of sensing characteristics could be observed. Meanwhile, the response and recovery time of the sensor to 50 ppm H 2 S gas were as low as 22 s and 6 s, respectively. In addition, mechanisms of the development of the free-standing TiNT array film and the sensor towards H 2 S were discussed. In conclusion, its outstanding sensing properties and readily fabrication of the TiNT array film sensor presented the potential industrial applications.

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“…The studies on the functionalization of spherical gold nanoparticles, growth of other shapespecific gold nanoparticles has also been an active area of research interest in the past few years Gold nanoparticles has been reported for several other particle morphologies, including sphere [10,15], dendrites [12], rods [6,13]. The formation of these gold nanocrystals makes possible the examination of new optical properties associated with shape variations.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Catalytic Activity of Branched Gold Nanoparticles in Aqueous Medium

Diem¹

2018

JST

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In this article, a simple method for the preparation of multi-branched gold nanoparticles from an aqueous solution of silver seeds, cetyl-trimethylammonium bromide (CTAB), HAuCl 4 , and Pluronic F-127 was described. It was found that morphologies and sizes of gold nanostructures (AuNPs) depended strongly on such experimental parameters as concentrations of Pluronic F-127 and Au 3+ . The products were characterized by transmission electron microscopy (TEM). Interestingly, the multi -branched AuNPs were found to serve as an effective catalyst for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in the presence of NaBH 4 . Kinetic data have been obtained from monitoring the concentrations of 4-NP and BH 4 -by UV-vis spectroscopy.

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Shape and size controlled synthesis of Au nanorods: H 2 S gas-sensing characterizations and antibacterial application

Cited by 31 publications

References 35 publications

Impedimetric detection of pathogenic bacteria with bacteriophages using gold nanorod deposited graphite electrodes

Impedimetric detection of pathogenic bacteria with bacteriophages using gold nanorod deposited graphite electrodes

A fast response and recovery H2S gas sensor based on free-standing TiO2 nanotube array films prepared by one-step anodization method

Synthesis and Catalytic Activity of Branched Gold Nanoparticles in Aqueous Medium

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