Photochemical decoration of silver nanoparticles on graphene oxide nanosheets and their optical characterization

Lan, Nguyen Thi; Chi, Do Thi; Dinh, Ngo Xuan; Hùng, Nguyễn Duy; Hoang, Lan; Tuấn, Phạm Anh; Thang, Le Hong; Trung, Nguyễn Ngọc; Hoa, Nguyen Quang; Huy, Tran Quang; Quy, Nguyen Van; Duong, Thanh–Tung; Phan, Vu Ngoc; Le, Anh‐Tuan

doi:10.1016/j.jallcom.2014.07.042

Cited by 51 publications

(19 citation statements)

References 21 publications

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“…This result is fully consistent with the calculation from TEM images. Furthermore, the broadening of the full width at half maximum (FWHM) of the XRD pattern reveals the nanoscale sizes of Ag-NPs [19]. The obtained TEM and XRD results confirmed that the Ag-NPs are successfully anchored to the surface of functionalized MWCNTs using a modified photochemical method (Tollens process) [19].…”

Section: Formation Of Ag-nps On Functionalized Mwcntsmentioning

confidence: 66%

“…The variation of the other peaks (1600, 1400, and 1063 cm −1 ) in the case of Ag-MWCNTs demonstrates the interaction between silver ions and functional groups through the formation of a coordination bond or through simple electrostatic attraction. The FTIR results demonstrate that strong interactions may exist between Ag-NPs and the remaining hydroxyl and carboxyl groups on the surface of the MWCNTs [16,19].…”

Section: Interaction Of Ag-nps On Surface Of Mwcntsmentioning

confidence: 94%

“…The D / G values were approximately 0.99 and 1.01 for MWCNTs and Ag-MWCNTs samples, respectively. The observed increasing D / G -value suggested a decrease in in-plane size of graphene upon the reduction process [19]. The partial reduction of MWCNTs could cause fragmentation along the reactive sites and might yield new graphitic domains, leading to smaller sizes and higher number of graphene than that of MWCNTs before the reduction.…”

Section: Interaction Of Ag-nps On Surface Of Mwcntsmentioning

confidence: 97%

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Decoration of Silver Nanoparticles on Multiwalled Carbon Nanotubes: Antibacterial Mechanism and Ultrastructural Analysis

Dinh

Quy

Huy

et al. 2015

Journal of Nanomaterials

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Recently, development of carbon nanocomposites composed of carbon nanostructures and metal nanoparticles has attracted much interests because of their large potential for technological applications such as catalyst, sensor, biomedicine, and disinfection. In this work, we established a simple chemistry method to synthesize multiwalled carbon nanotubes (MWCNTs) decorated with silver nanoparticles (Ag-NPs) using a modified photochemical reaction (Tollens process). The formation and interaction of Ag-NPs with functionalized groups on the surface of MWCNTs were analyzed by X-ray diffraction, transmission electron microscopy, Raman spectroscopy, and Fourier-transform infrared spectroscopy. The average size of Ag-NPs on the MWCNTs was approximately ∼7 nm with nearly uniform size distribution. Antibacterial effect of Ag-MWCNTs nanocomposites was evaluated against two pathogenic bacteria including Gram-negative Escherichia Coli and Gram-positive Staphylococcus aureus bacteria. Interaction and bactericidal mechanism of Ag-MWCNTs with tested bacteria was studied by adapting the electron microscopy. Analysis on ultrastructural changes of bacterial cells indicates that antibacterial action mechanism of Ag-MWCNTs is physical interaction with cell membrane, the large formation of cell-Ag-MWCNTs aggregates, and faster destructibility of cell membrane and disruption of membrane function, hence resulting in cells death.

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Section: Formation Of Ag-nps On Functionalized Mwcntsmentioning

confidence: 66%

Section: Interaction Of Ag-nps On Surface Of Mwcntsmentioning

confidence: 94%

Section: Interaction Of Ag-nps On Surface Of Mwcntsmentioning

confidence: 97%

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Decoration of Silver Nanoparticles on Multiwalled Carbon Nanotubes: Antibacterial Mechanism and Ultrastructural Analysis

Dinh

Quy

Huy

et al. 2015

Journal of Nanomaterials

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“…1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 To elucidate the interaction of MnFe2O4 NPs with the functional groups on the surface of GO sheets, Fourier Transform Infrared (FTIR) spectra were recorded and analyzed. FTIR is a useful technique to confirm that the nanoparticles are anchored to GO surface, as has been shown by several groups 15,16 including ours 17 . Fig.…”

Section: Structural Characterizationmentioning

confidence: 69%

“…These peaks are similar to those from JCPDS 10-0319 for a cubic spinel ferrite structure of MnFe2O4. The XRD pattern of the GO nanosheets exhibited a broad peak at 10.9º (not shown here) corresponding to the (002) interlayer spacing of 0.81 nm 17 .…”

Section: Structural Characterizationmentioning

confidence: 87%

Enhanced magnetic anisotropy and heating efficiency in multi-functional manganese ferrite/graphene oxide nanostructures

Giang

Tam

et al. 2016

Nanotechnology

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A promising nanocomposite material composed of MnFe2O4 (MFO) nanoparticles of ~17 nm diameter deposited onto graphene oxide (GO) nanosheets was successfully synthesized using a modified co-precipitation method. X-ray diffraction (XRD), transmission electron microscopy (TEM), and selected area electron diffraction (SAED) confirmed the quality of the synthesized samples. Fourier Transform Infrared (FTIR) measurements and analysis evidenced that the MFO nanoparticles were attached to the GO surface. Magnetic measurements and analysis using the modified Langevin model evidenced the superparamagnetic characteristic of both the bare MFO nanoparticles and the MFO-GO nanocomposite at room temperature, and an appreciable increase of the effective anisotropy for the MFO-GO sample. Magnetic hyperthermia experiments performed by both calorimetric and AC magnetometry methods indicated that relative to the bare MFO nanoparticles, the heating efficiency of the MFO-GO nanocomposite was similar at low ac fields (0-300 Oe) but became progressively larger with increasing ac fields (> 300 Oe). This has been related to the higher effective anisotropy of the MFO-GO nanocomposite. In comparison with the bare MFO nanoparticles, a smaller reduction in the heating efficiency was observed in the MFO-GO composites when MFO-GO were embedded in agar or when their concentration was increased, indicating that the GO helped minimize the physical rotation and aggregation of the MFO nanoparticles. These findings can be of practical importance in exploiting this type of nanocomposite for advanced hyperthermia. Magnetoimpedance-based biodetection studies also indicated that the MFO-GO nanocomposite could be used as a promising magnetic biomarker in biosensing applications.

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A Novel Electrochemical Immunosensor For Sulfadimidine Detection Based On Staphylococcal Protein A−AuNPs/Ag−GO−Nf Modified Electrode[]**

et al. 2021

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Sulfadimidine (SM2) is a kind of synthetic sulfadiazine antibiotics. Excessive use of SM2 in animal breeding can lead to animal‐derived food residues, which will bring potential risks to human health. Herein, a sensitive label‐free electrochemical immunosensor using silver nanoparticles (AgNPs) as redox probe was developed for the specific detection of SM2. Firstly, the Ag−GO nanocomposites were prepared by in‐situ reduction of AgNPs on graphene oxide (GO) surface with glucose. Gold nanoparticles (AuNPs) were reduced on the surface of Ag−GO nanocomposites by permanent electrodeposition. Staphylococcal protein A (SPA) was dripped onto the AuNPs modified electrode to absorb antibody (anti‐SM2). Herein, GO provided a large surface area for assembling a large number of AgNPs with redox activity. AuNPs were used to immobilize SPA and amplify the electrochemical signal. In addition, SPA with antibody targeting function was introduced to improve the efficiency of immune response. Under optimal conditions, the label‐free immunosensor showed a linear range of 63 pg/mL to 20 ng/mL with a limit of detection (LOD) of 3 pg/mL (S/N=3). Finally, the developed method showed excellent performance in practical application, which provided a promising possibility for the detection of other veterinary drug residues in animal derived food.

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Photochemical decoration of silver nanoparticles on graphene oxide nanosheets and their optical characterization

Cited by 51 publications

References 21 publications

Decoration of Silver Nanoparticles on Multiwalled Carbon Nanotubes: Antibacterial Mechanism and Ultrastructural Analysis

Decoration of Silver Nanoparticles on Multiwalled Carbon Nanotubes: Antibacterial Mechanism and Ultrastructural Analysis

Enhanced magnetic anisotropy and heating efficiency in multi-functional manganese ferrite/graphene oxide nanostructures

A Novel Electrochemical Immunosensor For Sulfadimidine Detection Based On Staphylococcal Protein A−AuNPs/Ag−GO−Nf Modified Electrode[]**

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