Plasmonic gold-embedded TiO2 thin films as photocatalytic self-cleaning coatings

Peeters, Hannelore; Keulemans, Maarten; Nuyts, Gert; Vanmeert, Frederik; Li, Chen; Minjauw, Matthias; Detavernier, Christophe; Bals, Sara; Lenaerts, Silvia; Verbruggen, Sammy W.

doi:10.1016/j.apcatb.2020.118654

Cited by 69 publications

(50 citation statements)

References 51 publications

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“…The doping of titania (TiO 2 ) with nano-gold decorations has recently enabled the development of highly efficient materials for sensors, energy, smart coating and environment [ 50 , 51 , 52 , 53 , 54 ]. In the present study, the authors selected one of the simplest, cost-effective and green procedures [ 35 ]: AuNP-decorating TiO2 were synthesized by reducing HAuCl 4 onto titania particles in aqueous suspension by a UV-light-catalyzed reaction.…”

Section: Resultsmentioning

confidence: 99%

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Characteristics and Performances of a Nanostructured Material for Passive Samplers of Gaseous Hg

Avossa

Cesare

Papa

et al. 2020

Sensors

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Passive air samplers (PASs) have been used for mapping gaseous mercury concentration in extensive areas. In this work, an easy-to-use and -prepare gold nanoparticle (NP)-based PAS has been investigated. The PAS is constituted of a microfibrous quartz disk filter impregnated of gold NP photo-growth on TiO2 NPs (Au@TiO2) and used as gaseous mercury adsorbing material. The disk was housed in a cylinder glass container and subjected to an axial diffusive sampling. The adsorbed mercury was measured by thermal desorption using a Tekran® instrument. Different amounts of Au@TiO2 (ranging between 4.0 and 4.0 × 10−3 mg) were deposited by drop-casting onto the fibrous substrate and assessed for about 1 year of deployment in outdoor environment with a mercury concentration mean of about 1.24 ± 0.32 ng/m3 in order to optimize the adsorbing layer. PASs showed a linear relation of the adsorbed mercury as a function of time with a rate of 18.5 ± 0.4 pg/day (≈1.5% of the gaseous concentration per day). However, only the PAS with 4 mg of Au@TiO2, provided with a surface density of about 3.26 × 10−2 mg/mm2 and 50 μm thick inside the fibrous quartz, kept stability in working, with a constant sampling rate (SR) (0.0138 ± 0.0005 m3/day) over an outdoor monitoring experimental campaign of about 1 year. On the other hand, higher sampling rates have been found when PASs were deployed for a few days, making these tools also effective for one-day monitoring. Furthermore, these PASs were used and re-used after each thermal desorption to confirm the chance to reuse such structured layers within their samplers, thus supporting the purpose to design inexpensive, compact and portable air pollutant sampling devices, ideal for assessing both personal and environmental exposures. During the whole deployment, PASs were aided by simultaneous Tekran® measurements.

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Section: Resultsmentioning

confidence: 99%

“…Moreover, it is known that noble metal-based PASs can undergo memory effects [ 49 , 50 , 51 , 52 ] and lose their structural integrity (loss of adsorbing material) [ 65 ], which can influence sampler accuracy [ 49 ].…”

Section: Resultsmentioning

confidence: 99%

Characteristics and Performances of a Nanostructured Material for Passive Samplers of Gaseous Hg

Avossa

Cesare

Papa

et al. 2020

Sensors

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“…Functional plasmonic nanostructures have gained increasing interest in energy and environmental fields [1]. SERS has recently been introduced for effective sensing combined with noble metal systems by introducing hotspots to enhance electromagnetic enhancements [2,3].…”

Section: Introductionmentioning

confidence: 99%

Surface-Enhanced Raman Sensing of Semi-Volatile Organic Compounds by Plasmonic Nanostructures

Son

Jang

et al. 2021

Nanomaterials

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Facile detection of indoor semi-volatile organic compounds (SVOCs) is a critical issue to raise an increasing concern to current researchers, since their emissions have impacted the health of humans, who spend much of their time indoors after the recent incessant COVID-19 pandemic outbreaks. Plasmonic nanomaterial platforms can utilize an electromagnetic field to induce significant Raman signal enhancements of vibrational spectra of pollutant molecules from localized hotspots. Surface-enhanced Raman scattering (SERS) sensing based on functional plasmonic nanostructures has currently emerged as a powerful analytical technique, which is widely adopted for the ultra-sensitive detection of SVOC molecules, including phthalates and polycyclic aromatic hydrocarbons (PAHs) from household chemicals in indoor environments. This concise topical review gives updated recent developments and trends in optical sensors of surface plasmon resonance (SPR) and SERS for effective sensing of SVOCs by functionalization of noble metal nanostructures. Specific features of plasmonic nanomaterials utilized in sensors are evaluated comparatively, including their various sizes and shapes. Novel aptasensors-assisted SERS technology and its potential application are also introduced for selective sensing. The current challenges and perspectives on SERS-based optical sensors using plasmonic nanomaterial platforms and aptasensors are discussed for applying indoor SVOC detection.

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“…Titanium dioxide TiO 2 is a versatile transition-metal oxide that has a large number of applications such as protective coatings [1][2], Photodetector [3], optical thin films [4][5], microelectronic devices [6], self-cleaning [7][8][9], and photocatalyst for the breakdown of organic contaminants in wastewaters [10][11][12][13]. All these applications are a traduction of their attractive properties such as high transmission in the visible region, wide band gap for anatase phase (3.4 eV), and high photocatalytic activity under UV light [14].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic activity of Al/Ni-doped TiO2 films synthesized by sol-gel method: Effect of sunlight photocatalysis on the catalysts properties

Temam¹,

Djani²,

Rahmane³

et al. 2021

Preprint

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Photocatalytic activity of semiconductors is affected by the nature of metal dopant. To study the effect of non-transition and transition metal on the physical and optical properties of TiO2 based photocatalysts; Al and Ni-doped TiO2 thin films respectively were prepared via a sol-gel dip-coating method. The effect of the photocatalysis process on the properties of TiO2 based thin films was investigated. The photocatalytic activity was calculated from methylene blue dye degradation under sunlight irradiation. XRD results show that un-doped TiO2 films were grown with anatase phase, whereas, the Ni and Ni/Al-doped TiO2 films show Ti4O7 single phase. The presence of Al preferred the rutile phase. No phases related to NiO or Al2O3 were detected. Ni-TiO2 photocatalyst shows high photocatalytic activity (~ 93%) thanks to the high content of O and Ti, wide bandgap (3.35 eV), low crystal size (6.87 nm), high film thickness (288 nm), and high surface roughness (44.5 nm). After photocatalysis, all the films show a decrease in O content and thickness, whereas the indirect bandgap values were increased which suggesting the reuse with low photocatalytic activity.

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Plasmonic gold-embedded TiO2 thin films as photocatalytic self-cleaning coatings

Cited by 69 publications

References 51 publications

Characteristics and Performances of a Nanostructured Material for Passive Samplers of Gaseous Hg

Characteristics and Performances of a Nanostructured Material for Passive Samplers of Gaseous Hg

Surface-Enhanced Raman Sensing of Semi-Volatile Organic Compounds by Plasmonic Nanostructures

Photocatalytic activity of Al/Ni-doped TiO2 films synthesized by sol-gel method: Effect of sunlight photocatalysis on the catalysts properties

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