Tailor-made metal nanoparticles as SERS substrates

Hubenthal, Frank; Blázquez-Sánchez, David; Borg, N.; Schmidt, Heinar; Kronfeldt, H.-D.; Träger, F.

doi:10.1007/s00340-009-3373-7

Cited by 29 publications

(22 citation statements)

References 30 publications

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“…For the trace analysis of PAHs in an aqueous solution, several types of SERS sensor have been applied including silver colloid-based sol-gel films [7,8], tailor-made metal nanoparticles [9], self-assembled gold colloid films [10], partition layer-modified silver films over nanospheres [11] and dithiocarbamate calixarene (DTCX) functionalized silver colloids [12]. The sensitivity of a SERS substrate depends on the long-term electromagnetic enhancement in the vicinity of metal nanoparticles and the short-term chemical enhancement due to the charge transfer between the analyte and metal nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Naturally grown Ag nanoparticles on quartz substrates as SERS substrate excited by a 488 nm diode laser system for SERDS

et al. 2012

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A silver nanoparticle ensemble was prepared under ultrahigh vacuum (UHV) conditions by Volmer-Weber growth on a quartz substrate for surface-enhanced Raman scattering (SERS) investigations of pyrene molecules. To tune the surface plasmon resonance frequency in the vicinity of the excitation wavelength of 488 nm of the diode laser, the morphology of the silver nanoparticles was optimized. The substrates were mounted in a flow-through cell as part of the optical Raman set-up. A microsystem diode laser generates two slightly different emission wavelengths (λ = 487.61 nm and λ = 487.91 nm) with a spectral width <10 pm and an optical power of 20 mW, i.e. SERS experiments are possible but also shifted excitation Raman difference spectroscopy (SERDS) can be carried out. For trace analysis of pyrene in water we demonstrate SERS/SERDS experiments which lead to a limit of detection of 2 nmol/l for pyrene. These results suggest that with silver nanoparticle ensembles excited at their plasmon resonance at 488 nm combined SERS/SERDS measurements can be effectively performed for in-situ trace analysis of pollutant chemicals in water.

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Section: Introductionmentioning

confidence: 99%

Naturally grown Ag nanoparticles on quartz substrates as SERS substrate excited by a 488 nm diode laser system for SERDS

et al. 2012

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“…Small gold particles supported on dielectric supports have attracted considerable attention due to their extraordinary properties that are exploited in numerous applications [1][2][3][4][5][6][7][8][9][10][11]. In recent years the main foci of interest have been the optical properties, which are in the visible range and dominated by the excitation of localized surface plasmon polariton resonances, i.e., by a collective excitation of the conduction band electrons.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, optical spectroscopy combined with atomic force microscopy has been used in the past to characterize the morphology of noble metal nanoparticle ensembles [6,17,18,20,41,42]. However, for a detailed modeling of the optical properties of supported nanoparticle ensembles, three important issues have to be overcome:…”

Section: Introductionmentioning

confidence: 99%

Determination of Morphological Parameters of Supported Gold Nanoparticles: Comparison of AFM Combined with Optical Spectroscopy and Theoretical Modeling versus TEM

2012

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The morphology of small gold particles prepared by Volmer-Weber growth on sapphire substrates have been investigated by two different characterization techniques. First, by non-extensive atomic force microscopy (AFM) in combination with optical spectroscopy and modeling of the optical properties using a theoretical model, recently developed in our group. Second, by extensive transmission electron microscopy (TEM). Comparing the results obtained with both techniques demonstrate that for small gold nanoparticles within the quasistatic limit, the morphological properties can be precisely determined by an appropriate theoretical modeling of the optical properties in combination with simple AFM measurements. The apparent mean axial ratio of the nanoparticles, i.e., the axial ratio that corresponds to the center frequency of the ensemble plasmon resonance, is obtained easily from the extinction spectrum. The mean size is determined by the nanoparticle number density and the amount of deposited material, measured by AFM and a quartz micro balance, respectively. To extract the most probable axial ratio of the nanoparticle ensemble, i.e., the axial ratio that corresponds to the most probable nanoparticle size in the ensemble, we apply the new theoretical model, which allows to extract the functional dependence of the nanoparticle shape on its size. The morphological parameters obtained with this procedure will be afterwards compared to extensive TEM measurements. The results obtained with both techniques yield excellent agreement. For example, the lateral dimensions of the nanoparticles after deposition of 15.2 × 10 15 atoms/cm 2 of gold has been compared. While a mean lateral diameter of (13 ± 2) nm has been extracted from AFM, optical spectroscopy and modeling, a value of (12 ± 2) nm is derived from TEM.

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“…The number of laser shots applied for the metal target was 400 pulses. Atomic force microscope (AFM) (Model AA3000, Angstrom Advance Inc., USA) and transmission electron microscope (TEM) (CM10-PW6020, Philips, Germany) were used to examine the size and size distributions of the metals nanoparticles [18].…”

Section: Preparation and Characterization Of Aunps And Agnpsmentioning

confidence: 99%

Biochemical study for gold and silver nanoparticles on thyroid hormone levels in saliva of patients with chronic renal failure

Jassim

Al-Kazaz

2013

Eur. J. Chem.

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KEYWORDSNoble metal nanoparticles were synthesized directly by pulsed laser ablation (Nd:YAG, λ=1064 nm) of gold and silver plates immersed in pure water. Concentrations of the nanoparticles were determined by atomic absorption spectroscopy measurement. Atomic force microscope and transmission electron microscope analysis were used to characterize the size and size distributions of the metals nanoparticles. The objective of this work is studying the effects of presence gold and silver nanoparticles on the levels of triiodothyronine hormone (T3) in saliva of patients with chronic renal failure their thyroid had disorder (hypothyroidism). Also the study characterized the binding between the antiT3antibody with its antigen i.e., T3 in saliva patients in the presence affixed size concentration of nanoparticles to improve and modify a competitive ELISA method. It is found that both gold and silver nanoparticles demonstrated activation effect on the binding between anti-T3 antibody and antigen (T3) in the saliva of patients and these effects increased with increasing the concentrations and size for both nanoparticles (gold was more activation effect than silver). Optimization of experimental conditions for the binding in the saliva were: 40 μL and 20 μL of saliva (T3) in presence both silver and gold nanoparticle, respectively, pH = 7.4 of 0.2 M phosphate buffer was selected as the detection solution, the temperature of incubation was 22 °C while the incubation time were 30 min, 90 min for silver and gold nanoparticles, respectively.

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Tailor-made metal nanoparticles as SERS substrates

Cited by 29 publications

References 30 publications

Naturally grown Ag nanoparticles on quartz substrates as SERS substrate excited by a 488 nm diode laser system for SERDS

Naturally grown Ag nanoparticles on quartz substrates as SERS substrate excited by a 488 nm diode laser system for SERDS

Determination of Morphological Parameters of Supported Gold Nanoparticles: Comparison of AFM Combined with Optical Spectroscopy and Theoretical Modeling versus TEM

Biochemical study for gold and silver nanoparticles on thyroid hormone levels in saliva of patients with chronic renal failure

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