“…As observed in the PL spectrum of SiO 2 @Ag in Fig. 4b, the broadband at about 430 nm originated from different defect centers of SiO 2 NSs [40,41]. The PL spectrum of the R6G appears to be a band at 600 nm.…”
Section: The Mef and Sers Characterizations Of Sio 2 @Ag Nanocompositesmentioning
SiO 2 @Ag nanocomposite (NC) has been synthesized by the chemical reduction and Stӧber method for enhancement photoluminescence (PL) and Raman characteristics of Rhodamine 6G (R6G) and Malachite green (MG) dyes. As-synthesized SiO 2 @Ag nanocomposite indicated SiO 2 nanosphere (NS) and Ag nanoparticle (NP) morphologies. The SiO 2 @Ag nanocomposite was high quality with a wellde ned crystallite phase with average sizes of 24 nm and 132 nm for Ag NP and SiO 2 NC, respectively. By using SiO 2 @Ag NC, the PL intensity of the R6G (at 59.17 ppm) was increased approximately 133 times.The surface-enhanced Raman spectroscopy (SERS) of the MG (at 1.0 ppm) with SiO 2 @Ag NC as substrate, clearly observed vibrational modes in MG dye at 798, 916, 1172, 1394, and 1616 cm − 1 . As a result, the SERS enhancement factor (EF SERS ) at 1172 cm − 1 obtained 6.3x10 6 . This pioneering study points to the potential of SiO 2 @Ag nanocomposite as a promising material for effective photoluminescence and Raman characteristics at low-concentration dyes.
“…As observed in the PL spectrum of SiO 2 @Ag in Fig. 4b, the broadband at about 430 nm originated from different defect centers of SiO 2 NSs [40,41]. The PL spectrum of the R6G appears to be a band at 600 nm.…”
Section: The Mef and Sers Characterizations Of Sio 2 @Ag Nanocompositesmentioning
SiO 2 @Ag nanocomposite (NC) has been synthesized by the chemical reduction and Stӧber method for enhancement photoluminescence (PL) and Raman characteristics of Rhodamine 6G (R6G) and Malachite green (MG) dyes. As-synthesized SiO 2 @Ag nanocomposite indicated SiO 2 nanosphere (NS) and Ag nanoparticle (NP) morphologies. The SiO 2 @Ag nanocomposite was high quality with a wellde ned crystallite phase with average sizes of 24 nm and 132 nm for Ag NP and SiO 2 NC, respectively. By using SiO 2 @Ag NC, the PL intensity of the R6G (at 59.17 ppm) was increased approximately 133 times.The surface-enhanced Raman spectroscopy (SERS) of the MG (at 1.0 ppm) with SiO 2 @Ag NC as substrate, clearly observed vibrational modes in MG dye at 798, 916, 1172, 1394, and 1616 cm − 1 . As a result, the SERS enhancement factor (EF SERS ) at 1172 cm − 1 obtained 6.3x10 6 . This pioneering study points to the potential of SiO 2 @Ag nanocomposite as a promising material for effective photoluminescence and Raman characteristics at low-concentration dyes.
“…The binding energy peaks at 528.6 eV and 530.1 eV indicate the attachment of lattice oxygen and OH − ions to Ti 3+ ions in TiO 2 @SiO 2 NSs, respectively. 52 Fig. 3d shows the XPS spectrum of Si 2p, which exhibits a peak at 99.8 eV corresponding to Si +4 ions present in amorphous silica.…”
Section: Resultsmentioning
confidence: 99%
“…Steady-state amperometric measurements for the TiO 2 @SiO 2 NS/PGE-modified electrode versus Ag/AgCl were obtained in 0.1 M PBS solution of pH 7.4 on successive increment with AA at an optimized potential of 0.2 V. We obtained this optimized potential by considering the fact that high potential tends to enhance a wide linear range and may lead to non-specific interference signals. 52 Fig. 12a depicts the amperometric response on successive addition of AA (50–2500 μM) with a constant time interval (50 s).…”
An electrochemical sensing electrode based on titania (anatase) and silica nanospheres (TiO2@SiO2 NSs) loaded on pencil graphite electrode (TiO2@SiO2NSs/PGE) was fabricated and scrutinized for L-ascorbic acid detection. PGE surface was...
“…The broad absorption band below 600 nm is associated with the d-d transition of Cu(II) and the weak absorption in the range of 600–800 nm is due to the intrinsic excitation band of CuO component and the d-d transition of Cu(II) species [ 51 , 52 ]. Similarly, the diffuse reflectance spectrum of m-TiO 2 /CdS showed a synergistic effect between CdS nanoparticles and TiO 2 mesoporous support which resulted in a high absorption capacity in the visible region [ 53 ]. Fig.…”
In this work, macroscopic TiO 2 monoliths are proposed to serve simultaneously as support and co-catalyst in a continuous flow photoreactor. The impregnation via one-pot of mesoporous TiO 2 with CdS (m-TiO 2 /CdS) and CuO (m-TiO 2 /CuO) nanoparticles enabled the formation of photocatalytic heterojunctions retaining high specific surface area (~ 100 m 2 /g). The impregnated monoliths of 2-3 mm in size were employed as photocatalysts to inactivate airborne bacteria under blue light, reducing the emission of living airborne bacteria up to 0.1% and 37.7% when using m-TiO 2 /CdS and m-TiO 2 /CuO, respectively. Bacteria were characterized and quantified by flow cytometry and cell lysis was confirmed by SEM, detecting collapsed bacteria. Along 96 h of continuous photocatalysis at a flow rate of 2.2 L/min, the cell concentration presented maxima and minima due to the adsorption-desorption stages of bioaerosols over the catalysts, in concordance with thermal gravimetric analysis. The reactivation of catalysts was achieved by calcination at 400 °C, however, after a third re-cycle, the photocatalytic activity for all monoliths was practically negligible because the physicochemical surface changes hinder the adequate bioaerosol adsorption. These porous systems could emerge as promising gas-phase catalysts since the mass transport is facilitated by porosity and the release of catalyst nanoparticles is avoided by the active support, providing a safe and viable model for bioaerosols inactivation to improve indoor air quality with the use of interior lighting.
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