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Surface plasmon resonance

Tìm thấy 20+ kết quả cho từ khóa "Surface plasmon resonance"

Gold-assembled silica-coated cobalt nanoparticles as efficient magnetic separation units and surface-enhanced Raman scattering substrate

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An additional property of the surface plasmon resonance that can be regulated is its dependence on interparticle interactions. 16,17 Besides, nanoparticles can be assembled and bound onto functionalized planar substrates, which can be used as a SERS substrate.

Metallic nanoparticles: Synthesis, characterisation and application

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Eustis, S., El-Sayed, M.A., Why gold nanoparticles are more precious than pretty gold: Noble metal surface plasmon resonance and its enhancement of the radiative and nonradiative properties of nanocrystals of different shapes (2006) Chem. Long, N.N., Vu, L.V., Kiem, C.D., Doanh, S.C., Nguyet, C.T., Hang, P.T., Thien, N.D., Quynh, L.M., Synthesis and optical properties of colloidal gold nanoparticles (2009) J

Protein Methods (Revised)

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RESONANCE(1)SURFACE PLASMON RESONANCE(2) Molecules • Antibodies • Proteins Information • Peptides • Affinity • Compounds and fragments • Kinetics • Ion • Screening • Virus • Specificity • Concetration • Epitope binning • Immunogenicity • Thermodynamics SURFACE PLASMON RESONANCE (3)Affinity – How strong?

Synthesis and characterization of silver nanoparticles for antibacterial application against bacillus subtilis and pseudomonas aeruginosa

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It can be seen that the plasmon absorption band is located at 420 nm with the value of the absorbance intensity of about 2.83 (arbitrary unit) corresponding to the typical characteristic surface plasmon resonance (SPR) of the spherical AgNPs. In addition, the spectrum has only one peak, indicating that the particles are mainly spherical with small size and regular distribution.

Silver nanoparticles prepared by laser ablation and their optical characteristics

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Under the short laser pulses irradiation in the spectral range of the surface plasmon resonance, metal nanoparticles such as silver or gold nanoparticles are excited to upper electronic states by multiphoton absorption. The wet preparation methods range from synthesis by chemical reduction in solution, laser irradiation of metallic salt solution to laser ablation of metal plate.

Spectrophotometric analysis of stability of gold nanoparticles during catalytic reduction of 4-nitrophenol

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The stability of GNPs was studied in terms of surface plasmon resonance (SPR), as it is highly sensitive to the chemical environment, i.e. the refractive index of the species surrounding GNPs. SPR is a phenomenon that occurs as a result of the cooperative oscillation of valence electrons in the metallic nanoparticles. Stability of GNPs at different temperatures. The stability of GNPs at different temperatures was a new finding for this article.

Optical characterization of salt-induced swelling behavior of poly(N -isopropylacrylamide) terpolymer hydrogel layers

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Changes in the lower critical solution temperature of stimulus-responsive hydrogels are also observed due to the constraints when immobilized on solid substrates in the literature . research groups using ellipsometry [20,21], surface plasmon resonance spectroscopy (SPR neutron reflection [23], and atomic force microscopy (AFM) [23,24] in the literature. They found that the volume phase transition temperature changes between 25.3 and 44.9 ◦ C for 200 nm films depending on the pH of the solution.

Luận văn Thạc sĩ Vật lý: Ảnh hưởng của hiệu ứng plasmon bề mặt của các hạt nano vàng lên sự phát huỳnh quang của chất màu hữu cơ

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Ảnh hưởng của hiệu ứng plasmon lên huỳnh quang của chất phát quang. Phép đo phổ huỳnh quang. MEF Localized surface plasmon resonance Tăng cường huỳnh quang trong kim loại. Cấu trúc hóa học và màu phát xạ huỳnh quang của một số chất màu hữu cơ điển hình. Phổ hấp thụ và huỳnh quang của chất màu Rhodamine 123. Phổ hấp thụ và huỳnh quang của donor và acceptor. Minh họa sự truyền năng lượng cộng hưởng huỳnh quang giữa phát chất huỳnh quang (donor) và hạt nano kim loại (acceptor.

Application of synthesized copper nanoparticles using aqueous extract of Ziziphus mauritiana L. leaves as a colorimetric sensor for the detection of Ag+

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Brownish red color was initial indication of the formation of Zm-CuNPs while it was confirmed by surface plasmon resonance (SPR) band at wavelength of 584 nm using ultraviolet-visible (UV-vis) spectroscopy. Synthesized Zm-CuNPs were characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), atomic force microscopy (AFM), and X-ray diffractometry (XRD).

Luận văn Thạc sĩ Vật lý: Nghiên cứu tính chất phát xạ của chất phát quang trên màng nano bạc để xác định các plasmonic hoạt động

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Cỏc vật liệu SERS cú độ nhạy cao cú thể phỏt hiện đƣợc cỏc phõn tử cú độ phong phỳ thấp bằng cỏch khuếch đại trƣờng điện từ thụng qua sự kớch thớch của cộng hƣởng plasmon bề mặt cục bộ (Localized Surface Plasmon Resonance, LSPR) của cỏc cấu trỳc nano kim loại plasmonic.

Detection of bacteria using antimicrobial polymer derived via ring-opening metathesis (romp) pathway

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In the first part of the study, block and random copolymers were synthesized, and their biocidal activities were tested on the glass surface. For fast, inexpensive, high-precision analysis, various immunosensors, which are based on the antigenicity of the target bacterial cells, have been developed using fluorescence electrochemical impedance, quartz crystalline microbalance (QCM), and surface plasmon resonance (SPR) [5,16–20]. Determination of the solid phase antibacterial activity 2.5.1.

Synthesis of intracellular and extracellular gold nanoparticles with a green machine and its antifungal activity

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The appearance of the characteristic surface plasmon resonance (SPR) band of AuNPs confirms nanoparticle formation. The formation of gold nanoparticles with receiving pink- reddish color appearance of the solution was confirmed (Figure 3).. According to the reaction color and the intensity of the SPR bands, pH = 8 was determined as the optimum value.

Hiện tượng plasmonic của các hạt nano sắt từ Co trong các màng mỏng Co-Ag và Co-Al2O3

277326.pdf

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SEM Scanning Electron Microscope Kính hin t quét SERS Surface Enhanced Raman Spectroscopy Tán x ng b mt SNOM Near-field Scanning Optical Microscope Kính hin vi quang hc ng gn SPE Spinplasmonic electron n t spinplasmonic EELS Electron Energy Loss Spectroscopy Ph t ng n t SPP Surface Polariton Plasmon Plasmon polariton b mt SPR Surface Plasmon Resonance Cng plasma b mt TEM Transmission Electron Microscope Kính hin t truyn qua TMR Tunneling Magnetoreristance

Preparation of a portable calorimetry kit and one-step spectrophotometric nanomolar level detection of L-Histidine in serum and urine samples using sebacic acid capped silver nanoparticles

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The surface plasmon resonance (SPR) band of SA-AgNPs appeared at 420 nm [10], and could be quenched by the presence of L -Histidine. The detection limit as well as the con- centration of L -Histidine were calculated. Moreover, a 268-fold excess of common interferences did not interfere with the detec- tion of 18.1 10 6 M of L -Histidine. We effectively utilized SA- AgNPs to detect L -Histidine in blood serum and urine samples.. SA-AgNPs synthesis.

Green biosynthesis, characterization, and cytotoxic effect of magnetic iron nanoparticles using Brassica Oleracea var capitata sub var rubra (red cabbage) aqueous peel extract

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This band indicates the formation of IONPs because it is within the range of the surface plasmon resonance (SPR) for IONPs [32,33].. FTIR analysis is frequently preferred to identify the existence of functional groups on iron nanoparticles. The FTIR spectrum of IONPs show the prominent peaks at the and 457 cm –1 wavenumbers (Figure 2B). Illustration of IONPs synthesis.. Figure 3A shows the morphology of the iron nanoparticles synthesized by Brassica oleracea var.

Spectrophotometric and colorimetric determination of gallium (III) with p-aminohippuric acid-functionalized citrate capped gold nanoparticles

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The PVA encapsulated Cit-AuNPs demonstrated the surface plasmon resonance (SPR) band at 520 nm. A molar extinction coefficient (ε) for Cit-AuNPs and PVA-Cit-AuNPs was calculated to be ε mol –1 L cm –1 at 520 nm. At this time, the color of the double core-shell PVA-Cit-AuNPs was stable over a long time and these results exhibiting that the Cit-AuNPs do not tend to ag- glomerate in PVA gel. Further, the long-term stability of PVA-Cit-AuNPs was monitored.

Luận văn Thạc sĩ Vật lý: Đánh giá khả năng tiêu diệt vi khuẩn gây bệnh bằng nano vàng ở kích thước khác nhau trên cơ sở hiệu ứng quang nhiệt

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Sự thay đổi màu sắc này là do hiệu ứng plasmon bề mặt của hạt nano vàng tạo ra [7].. Màu sắc của dung dịch nano vàng phụ thuộc vào kích thước [7]. Một trong những tính chất quan trọng của nano vàng là hiệu ứng plasmon bề mặt (surface plasmon resonance: SPR). Quy trình tạo hạt nano vàng dùng lượng dung dịch nóng chloauric khử bằng dung dịch natri citrat [13]. Quá trình hình thành hạt nano vàng diễn ra như sau:. Các bước hình thành hạt nano vàng trong phương pháp Turkevich [11].

tổng hợp que nano vàng và nghiên cứu sự gắn kết với tác nhân sinh học

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Hình 1.4 Sự phân cực điện tử bề mặt của que nano vàng do điện trường của sóng điện từ Hình 1.5 Phổ hấp thụ lý thuyết của nano vàng d ng que [28] Tỷăl ăc nhăđ căxácăđ nhăbằngăt ăs ăchiềuădàiătrênăchiềuăngang c aăque nano vàng.ăHìnhăd ngăc aăqueănanoăvàngălàmăchoăph ătánăx ăvàăh păth ăánhăsángăcóăhaiă 3 đ nhă c ngă h ngă plasmonă bềă mặt:ă đ nhă c ngă h ngă plasmonă theoă tr c d că (Longitudinal surface plasmon resonance - LSPR) vàă đ nhă c ngă h ngă plasmonă theoă chiềuă ngangă (Transversal surface

Magnetite nanoparticles−based hydroxyl radical scavenging activity assay of antioxidants using N, N-dimethyl-p-phenylenediamine probe

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With the advancement of nanoscience, many new methods are on the rise due to extraordinary physico-chemical properties of nanoparticles, such as large surface-to-volume ratio for enhanced catalysis and surface plasmon resonance absorption giving rise to high sensitivity.. With the development of nanotechnology, nanoparticles have found numerous applications in science, health, and industries. In the presence of antioxidants. causing a decrease in the 553 nm-absorbance.

Nghiên cứu tổng hợp chất xúc tác quang Ag-TiO2/Perlite sử dụng cho quá trình phân hủy các hợp chất hữu cơ trong môi trường nước

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Synthesis of Surface Plasmon Resonance (SPR) Triggered Ag/TiO 2 photocatalyst for degradation of Endocrine Disturbing Compounds, Applied Surface Science . Sol-gel synthesis, characterization and properties of TiO 2 and Ag-TiO 2 coatings on titanium substrate, Surface and Coatings and Technology . SYNTHESIS OF AG-TIO 2 /PERLITE PHOTOCATALYST FOR THE DECOMPOSITION OF ORGANIC POLLUTANTS IN WATER SOLUTION.