Photoluminescence study of SBA-15@ZnO/Au nanocomposite for potential use in Staphylococcus aureus detection

Estakhri, Saba; Darabi, Elham; Akbari‐adergani, Behrouz; Elahi, Seyed Mohammad

doi:10.1007/s10934-021-01050-y

Cited by 2 publications

(4 citation statements)

References 42 publications

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“…Because of this, it is impossible to accurately determine the peak absorption in these samples and only an approximate can be set for it. In fact, strong peak which revealed around 560 nm because of the increase in effective charge transfer and the formation of more active sites [31]. Of course, in similar studies, the peak transmission of hexagonal NPs was observed in the 540 nm range, which is very close to our work [70,71].…”

Section: Uv-vis Spectrophotometrysupporting

confidence: 87%

“…θ BNPs (s3-s6) experiences a red shift from a typical peak absorption of individual BNPs (about 400 nm) by increasing the concentration of the silver ratio. This may be due to the different con gurations of conduction electrons on the surface and the interface between Au and AgNPs [31,72]. AuNPs are completely covered by AgNPs of different shell thickness.…”

Section: Uv-vis Spectrophotometrymentioning

confidence: 99%

“…Photochemical method [21], plane wave pseudopotential method [22], replacement reaction method [23], catalytic reduction [24], spray pyrolysis [25], wet-chemical method [7], chemical reduction [26,27], green synthesize [28][29][30], post-modi cation [31], electron beam deposition [32], ion implantation [33,34], electrochemical reduction [35], solid state dewetting (SSD) [36,37], pulse laser deposition (PLD) [38] and PLAL [39][40][41][42].…”

Section: Introductionmentioning

confidence: 99%

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Formation of Agshell/Aucore Bimetallic Nanoparticles by Pulsed Laser Ablation and Chemical Reduction Methods: The Effect Green Laser Wavelength and Colloidal/Solution Concentration

Dorranian

2023

Preprint

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The main purpose of this experimental research is to study the effects of different silver concentrations on the optical properties of bimetallic Agshell/Aucore nanoparticles. The gold nanoparticles are ablated by the PLAL technique of the gold target on the bottom of the container. The container is filled with colloidal silver nanoparticles and manufactured by chemical reduction. The colloidal solution of mixed nanoparticles is irradiated by the second harmonic of the pulsed laser Nd:YAG laser at 532 nm wavelength. The peak absorption of gold nanoparticles around 530 nm is used to transfer laser energy to nanoparticles and synthesis the Agshell/Aucore bimetallic nanoparticles. The volumetric ratio of nanoparticle solutions are the experimental variables. Bimetallic nanoparticles are distinguished by the following: X-ray diffraction pattern (XRD), spectroscopy in the range of UV-Vis-NIR and IR, Dynamic light scattering (DLS), Energy Dispersive Spectroscopy (EDS), Photoluminescence spectrum (PL) and, Fourier transform infrared spectroscopy (FT-IR). In addition, FE-SEM and TEM images are used to investigate nanoparticle size and morphology. One of the objectives of this research is the preparation of stable bimetallic systems and the study of optical properties, in order to check the reactivity of silver nanoparticles in the bimetallic system. Moreover, the shell thickness and catalytic properties of bimetallic structure with a different silver concentration is discussed. The following, dipole mode is shown in the visible area for every samples and quadrupole mode is not detected in sample with high silver concentration.

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Section: Uv-vis Spectrophotometrysupporting

confidence: 87%

Section: Uv-vis Spectrophotometrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Formation of Agshell/Aucore Bimetallic Nanoparticles by Pulsed Laser Ablation and Chemical Reduction Methods: The Effect Green Laser Wavelength and Colloidal/Solution Concentration

Dorranian

2023

Preprint

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“…Donnadio et al prepared the composites with antibacterial and antifungal activities by using two kinds of silica carriers commonly to load zinc oxide nanoparticles [25]. Estakhri et al prepared mesoporous silica loaded with nano zinc oxide as a photoluminescent mesoporous material [26]. In above studies, the as-prepared zinc oxide nanoparticles above 100 nm cannot be well dispersed in the pores of mesoporous silica.…”

Section: Introductionmentioning

confidence: 99%

Preparation of mesoporous silica-based nanocomposites with synergistically antibacterial performance from nano-metal (oxide) and polydopamine

Zhong

Qiu

et al. 2022

Nanotechnology

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In this work, a novel antibacterial nanocomposite system was developed using mesoporous silica (MSN) as an effective nanocarrier, and the resultant nanocomposites demonstrated remarkable antibacterial performance due to the synergistic effect among nano zinc oxides, silver nanoparticles, and polydopamine (PDA). The successful synthesis of MSN/ZnO@PDA/Ag nanocomposites was confirmed. The physicochemical properties and the morphologies of these nanocomposites were investigated. It was found that the particle size increased along with the evolution of these nanocomposites. Besides, nano zinc oxides were formed in the nanoconfinement channel of mesoporous silica with a particle size about 2 nm, and that of silver nanoparticle was less than 50 nm. In addition, the results revealed that the presence of mesoporous silica could effectively prevent the formation of large-size silver nanoparticles and facilitate their well dispersion. Due to the synergistic effect among nano zinc oxides, silver nanoparticles, and polydopamine, these nanocomposites exhibited remarkable antibacterial performance even at a low concentration of 313 ppm, and the antibacterial mechanism was also elucidated. Therefore, this work provides a facile and controllable approach to preparing synergistically antibacterial nanocomposites, and the remarkable antibacterial performance make them suitable for practical applications.

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Photoluminescence study of SBA-15@ZnO/Au nanocomposite for potential use in Staphylococcus aureus detection

Cited by 2 publications

References 42 publications

Formation of Agshell/Aucore Bimetallic Nanoparticles by Pulsed Laser Ablation and Chemical Reduction Methods: The Effect Green Laser Wavelength and Colloidal/Solution Concentration

Formation of Agshell/Aucore Bimetallic Nanoparticles by Pulsed Laser Ablation and Chemical Reduction Methods: The Effect Green Laser Wavelength and Colloidal/Solution Concentration

Preparation of mesoporous silica-based nanocomposites with synergistically antibacterial performance from nano-metal (oxide) and polydopamine

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