A high efficiency 3D photovoltaic microwire with carbon nanotubes (CNT)-quantum dot (QD) hybrid interface

Uddin, M. Jasim; Daramola, Deborah E.; Velasquez, Ever; Dickens, Tarik; Yan, Jun; Hammel, Emily; Cesano, Federico; Okoli, Okenwa I.

doi:10.1002/pssr.201409392

Cited by 34 publications

(21 citation statements)

References 25 publications

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“…In particular, among the photoactive materials, considerable efforts were mostly dedicated to exploring surface chemistry of TiO2 polytypes, [24,25,26,27,28,29,30,31], including surface functionalization and grafting of heterostructures, by adopting commonly a multi-technique approach, which helps to correlate morphology and structure with the peculiar properties of the obtained materials [32,33,34,35,36]. Specifically concerning TiO2, we mention those strategies aiming (1) to extend the TiO2 light absorption threshold from the UV to the Vis-NIR region and (2) to prolong the life of the excitons created under irradiation by retarding the electron/hole recombination.…”

Section: Heterostructures At Tio2 Surface As Organic and Inorganic Sementioning

confidence: 99%

Molecules and heterostructures at TiO2 surface: the cases of H2O, CO2, and organic and inorganic sensitizers

et al. 2019

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TiO2-based (nano)materials are widely exploited in systems and devices of actual technological interest, because of their outstanding physical and chemical properties, including chemical stability, long durability, non-toxicity abundance and low cost. For this, they are considered ideal for many practical applications including energy-related devices, photocatalysis, but are known to have some limitations. To improve their performance and then to find more efficient materials in the energy and environmental remediation fields, at first the investigation of the surface/interface properties at the molecular scale is required. In this contribution, a critical review of advances in the field of the TiO2 surface chemistry, highlighting the role of interactions at the molecular level, grafting and assembling/fabrication of suitable heterostructures, is reported. A few case studies, from the H2O, CO2 and acetylene interactions until to the grafting of organic/inorganic systems (graphene, MoS2) at the TiO2 surface, are highlighted. The discussed case studies are argued from their principles to the technological relevance. KeywordsTiO2 photocatalysis H2O, CO2 and C2H2 adsorption Graphene and MoS2/TiO2 hybrids Surface heterostructures IR spectroscopy STM and AFM HR-TEM Electronic spectroscopy Quantum modelling Preliminary remarks: motivation and structure of this review Particles and nanoparticles resulting from the combination of titanium, the second transition element more common in Earth's crust after iron, with oxygen to form TiO2, mainly in the anatase and rutile phases, are used in a wide array of products, devices and technologies. As reported by the Titanium Dioxide Manufacturers Associations (TDMA, https://tdma.info), gathering since 1974 the major producers of this material in Europe, the commercial and research area representing the "first coordination sphere" of the authors of this review, application for TiO2 across the EU, as well as across the globe, include paints, papers, pharmaceuticals, sunscreen and food (where it is listed as colourant E171). As a photocatalyst, titanium dioxide can be added to paints, cements, windows and tiles in order to decompose environmental pollutants, and as a white pigment (in this case called titanium white, Pigment White 6 or CI 77891), TiO2 is one of the most important raw materials for paints and coatings. Moreover, the range of innovative uses for TiO2 keeps on increasing. In recent years, for example, it has been used in the manufacture of cheap and efficient solar cells and building facades that can neutralize air pollution.

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Section: Heterostructures At Tio2 Surface As Organic and Inorganic Sementioning

confidence: 99%

Molecules and heterostructures at TiO2 surface: the cases of H2O, CO2, and organic and inorganic sensitizers

et al. 2019

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“…Among the suitable dopants, able to introduce the desired band gap, both metals and non-metals (nitrogen [10,11,12], iodine [13,14], fluorine [15,16] and carbon [17,18,19]) have been widely studied [20,21]. In particular, among non-metals [22], sulfur is considered a promising candidate for the tuning the band gap in TiO 2 [23,24]. Different from other heteroatomic counterparts, sulfur is for a fact isoelectronic to oxygen and can replace it without altering the electroneutrality of the solid [3].…”

Section: Introductionmentioning

confidence: 99%

Few-Layer MoS2 Nanodomains Decorating TiO2 Nanoparticles: A Case Study for the Photodegradation of Carbamazepine

et al. 2018

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S-doped TiO2 and hybrid MoS2/TiO2 systems have been synthesized, via the sulfidation with H2S of the bare TiO2 and of MoOx supported on TiO2 systems, with the aim of enhancing the photocatalytic properties of TiO2 for the degradation of carbamazepine, an anticonvulsant drug, whose residues and metabolites are usually inefficiently removed in wastewater treatment plants. The focus of this study is to find a relationship between the morphology/structure/surface properties and photoactivity. The full characterization of samples reveals the strong effects of the H2S action on the properties of TiO2, with the formation of defects at the surface, as shown by transmission electron microscopy (TEM) and infrared spectroscopy (IR), while also the optical properties are strongly affected by the sulfidation treatment, with changes in the electronic states of TiO2. Meanwhile, the formation of small and thin few-layer MoS2 domains, decorating the TiO2 surface, is evidenced by both high-resolution transmission electron microscopy (HRTEM) and UV-Vis/Raman spectroscopies, while Fourier-transform infrared (FTIR) spectra give insights into the nature of Ti and Mo surface sites. The most interesting findings of our research are the enhanced photoactivity of the MoS2/TiO2 hybrid photocatalyst toward the carbamazepine mineralization. Surprisingly, the formation of hazardous compounds (i.e., acridine derivatives), usually obtained from carbamazepine, is precluded when treated with MoS2/TiO2 systems.

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“…As a matter of fact, nanocrystals represent a class of materials, with enhanced properties and innovative functionalities (i.e., electrical, electronic, optical, mechanical, thermal, magnetic, catalytic, photocatalytic, etc.) [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Zinc Oxide Nanostructures: From Chestnut Husk-Like Structures to Hollow Nanocages, Synthesis and Structure

et al. 2018

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Tailor-made nanostructured ZnO cages have been catalytically grown on Au and Pt films covering silicon substrates, by a controlled evaporation process, which means an accurate choice of temperatures, times, gas flows (He in the heating, He/air during the synthesis), and Au/Pt film thickness. The effect of the process parameters affecting the morphology and the structure of the obtained materials has been investigated by XRD analysis, scanning electron microscopy (SEM) and atomic force microscopy (AFM) microscopies, and FTIR spectroscopies. In particular, the role of the synthesis temperature in affecting the size and shape of the obtained ZnO cages has been highlighted. It will be shown that by adopting higher temperatures, the protruding nanowhiskers several microns in length, covering the cages and exhibiting both basal and prismatic faces, change into very thin and narrow structures, with extended prismatic faces, prevailing with respect to the basal ones. At an even higher process temperature, the building up of Au particles aggregates inside and/or anchored to the walls of the hollow cages, without any evidence of elongated ZnO nanostructures will be highlighted. From FTIR spectra information on lattice modes of the investigated ZnO, materials have been obtained.

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A high efficiency 3D photovoltaic microwire with carbon nanotubes (CNT)-quantum dot (QD) hybrid interface

Cited by 34 publications

References 25 publications

Molecules and heterostructures at TiO2 surface: the cases of H2O, CO2, and organic and inorganic sensitizers

Molecules and heterostructures at TiO2 surface: the cases of H2O, CO2, and organic and inorganic sensitizers

Few-Layer MoS2 Nanodomains Decorating TiO2 Nanoparticles: A Case Study for the Photodegradation of Carbamazepine

Zinc Oxide Nanostructures: From Chestnut Husk-Like Structures to Hollow Nanocages, Synthesis and Structure

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