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Stabilność komponenta sieciującego warstwę receptorową biosensora po dodaniu nanocząstek złota

Kłos-Witkowska Aleksandra, Martsenyuk Vasyl

Pomiary Automatyka Robotyka

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2021

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R. 25, nr 1

49--52

PL

W pracy przeprowadzono badania stabilności składnika warstwy receptorowej biosensora po dodaniu nanocząstek złota. Wykazano przyspieszone zmiany konformacyjne pod wpływem Au. Obliczono względne procentowe zmiany w czasie między czystym białkiem a białkiem domieszkowanym Au. Wykazano, że z czasem zmiany te są większe i przekraczają 20 % w ostatnich dniach eksperymentu.

EN

In this study, the stability of the receptor layer component of a biosensor after addition of gold nanoparticles was investigated. Accelerated conformational changes under the influence of Au were demonstrated. The relative percentage changes over time between the pure protein and the Au doped protein were calculated. It was shown that these changes are greater with time and exceed 20 % in the last days of the experiment.

2

Au-RE-TiO2 nanocomposites. surface characteristics and photoactivity

Krukowska A., Reszczynska J., Zaleska A.

Physicochemical Problems of Mineral Processing

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2014

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Vol. 50, iss. 2

551--561

EN

Photocatalysts based on TiO2 co-doped with rare earth metal (RE) and gold nanoparticles have been prepared using a sol-gel method and followed by gold reduction. Specific surface areas of the modified photocatalysts were calculated by the Brunauer-Emmett-Teller method (BET). Diffuse reflectance spectra of the obtained photocatalysts were recorded with a UV-Vis spectrophotometer (DRS UV-Vis). The influence of the type of rare earth metal on photoactivity of Au-RE-TiO2 nanocomposites in model reaction manifested by toluene photodegradation in a gas phase was investigated. The obtained results showed that photodegradation of toluene in the gas phase is possible over Au-RE-TiO2 irradiated by UV or Vis light. The Au-RE-TiO2 photocatalysts relative to undoped TiO2, did not caused an increase of toluene degradation in the air under visible light. The samples doped with Er3+ or Pr3+ presented the highest activity in solar light among of Au-RE-TiO2. It was observed that both metal dopants affected the surface area of TiO2. The Au-RE-TiO2 photocatalysts relative to undoped TiO2 exhibited the absorption properties under Vis light.

3

Nanostructuring of thin Au films by means of short UV laser pulses

Grochowska K., Nedyalkov N., Atanasov P., Śliwiński G.

Opto-Electronics Review

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2011

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Vol. 19, No. 3

327-332

EN

The particle size distribution, morphology and optical properties of the Au nanoparticle (NP) structures for surface enhanced Raman signal (SERS) application are investigated in dependence on their preparation conditions. The structures are produced from relatively thin Au films (10-20 nm) sputtered on fused silica glass substrate and irradiated with several pulses (6 ns) of laser radiation at 266 nm and at fluencies in the range of 160-412 mJ/cm². The SEM inspection reveals nearly homogeneously distributed, spherical gold particles. Their initial size distribution of the range of 20-60 nm broadens towards larger particle diameters with prolonged irradiation. This is accompanied by an increase in the uncovered surface of the glass substrate and no particle removal is observed. In the absorption profiles of the nanostructures, the broad peak centred at 546 nm is ascribed to resonant absorption of surface plasmons (SPR). The peak position, halfwidth and intensity depend on the shape, size and size distribution of the nanostructured particles in agreement with literature. From peak intensities of the Raman spectra recorded for Rhodamine 6G in the range of 300-1800 cm⁻¹, the relative signal enhancement by factor between 20 and 603 for individual peaks is estimated. The results confirm that the obtained structures can be applied for SERS measurements and sensing.