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Ting Cheng, Richard O'Rorke, Raphael Francois Ortiz, Tay Yee Yan, Eva Hemmer, Fiorenzo Vetrone, Robert S Marks, Terry W J Steele
Near-infrared (NIR) triggered chemical delivery allows on-demand release with the advantage of external tissue stimulation. Bioresorbable polyester poly-L-lactic acid (PLLA) was compounded with photoadditives of neat zinc oxide (ZnO) nanoparticles and 980 → 365 nm LiYF4:Tm(3+), Yb(3+) upconverting nanoparticles (UCNP). Subsequently, neat ZnO and UCNP blended PLLA films of sub-50 μm thickness were knife casted with a hydrophobic small molecule drug mimic, fluorescein diacetate. The PLLA films displayed a 500 times increase in fluorescein diacetate release from the 50 mW NIR irradiated PLLA/photoadditive film compared to non-irradiated PLLA control films...
March 15, 2017: Acta Biomaterialia
Chaoliang Tan, Xiehong Cao, Xue-Jun Wu, Qiyuan He, Jian Yang, Xiao Zhang, Junze Chen, Wei Zhao, Shikui Han, Gwang-Hyeon Nam, Melinda Sindoro, Hua Zhang
Since the discovery of mechanically exfoliated graphene in 2004, research on ultrathin two-dimensional (2D) nanomaterials has grown exponentially in the fields of condensed matter physics, material science, chemistry, and nanotechnology. Highlighting their compelling physical, chemical, electronic, and optical properties, as well as their various potential applications, in this Review, we summarize the state-of-art progress on the ultrathin 2D nanomaterials with a particular emphasis on their recent advances...
March 17, 2017: Chemical Reviews
P Gibson
The 2017 Faraday Discussion on the topic of "Catalysis for Fuels" was unique in the sense that it was the first Faraday Discussion to be held on the continent of Africa. "Catalysis" and "Fuels" are both topics that could be widely interpreted and the session topics proved to be a relevant spread of old and new i.e. Fischer-Tropsch chemistry, biomass refining, zeolite conversions and photocatalysis. Most of the papers were underpinned by fundamental studies, catalyst design approaches, reports of in operando characterization and detailed speciation and micro kinetic analyses...
March 17, 2017: Faraday Discussions
Yoshikazu Hirose, Atsushi Itadani, Takahiro Ohkubo, Hideki Hashimoto, Jun Takada, Shigeharu Kittaka, Yasushige Kuroda
A nitrogen-doped TiO2 sample was prepared at 413 K by direct hydrothermal treatment of titanium isopropoxide in an aqueous solution of NH3. This new material has a large specific surface area of ca. 220 m(2) g(-1) because of its tubular structure and it exhibits a prominent absorption feature in the region between 400 and 650 nm. It responds strongly to light in the visible region, which is key to its potential performance as a photocatalyst that may improve the efficiency for utilization of solar energy. Actually, this sample exhibits very efficient activity in the decomposition of CH3COOH under visible light among the samples prepared...
March 17, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Phillip Christopher, Martin Moskovits
Surface plasmons have recently been harnessed to carry out processes such as photovoltaic current generation, redox photochemistry, photocatalysis, and photodetection, all of which are enabled by separating energetic (hot) electrons and holes-processes that, previously, were the domain of semiconductor junctions. Currently, the power conversion efficiencies of systems using plasmon excitation are low. However, the very large electron/hole per photon quantum efficiencies observed for plasmonic devices fan the hope of future improvements through a deeper understanding of the processes involved and through better device engineering, especially of critical interfaces such as those between metallic and semiconducting nanophases (or adsorbed molecules)...
March 16, 2017: Annual Review of Physical Chemistry
Man-Nung Su, Pratiksha Dongare, Debadi Chakraborty, Yue Zhang, Chongyue Yi, Fangfang Wen, Wei-Shun Chang, Peter Nordlander, John Elie Sader, Naomi J Halas, Stephan Link
Aluminum nanostructures support tunable surface plasmon resonances and have become an alternative to gold nanoparticles. While gold is the most-studied plasmonic material, aluminum has the advantage of high earth abundance and hence low cost. In addition to understanding the size and shape tunability of the plasmon resonance, the fundamental relaxation processes in aluminum nanostructures after photo-excitation must be understood, to take full advantage of applications such as photocatalysis and photodetection...
March 16, 2017: Nano Letters
Guido Panzarasa, Guido Soliveri, Gianluigi Marra, Laura Meda, Alberto Savoini, Silvia Ardizzone, Mario Salvalaggio
The controlled shaping of nanoparticles' morphology is one of the pillars of nanotechnology. Here, we demonstrate that photocatalytic lithography, a technique already proved to be useful in materials science, can act as a dry etching technique for noble metal nanoparticles. Triangular silver nanoprisms are self-assembled on titanium dioxide films and photocatalytically shaped into discoidal particles upon irradiation with near-UV light. The obtained patterned surfaces show a dramatically different surface-enhanced Raman scattering response, suggesting the utility of our approach for the development of sensors...
April 18, 2017: Nanotechnology
Binsong Li, Kaifu Bian, J Matthew D Lane, K Michael Salerno, Gary S Grest, Tommy Ao, Randy Hickman, Jack Wise, Zhongwu Wang, Hongyou Fan
Gold nanostructured materials exhibit important size- and shape-dependent properties that enable a wide variety of applications in photocatalysis, nanoelectronics and phototherapy. Here we show the use of superfast dynamic compression to synthesize extended gold nanostructures, such as nanorods, nanowires and nanosheets, with nanosecond coalescence times. Using a pulsed power generator, we ramp compress spherical gold nanoparticle arrays to pressures of tens of GPa, demonstrating pressure-driven assembly beyond the quasi-static regime of the diamond anvil cell...
March 16, 2017: Nature Communications
Qichen Yuan, Dong Liu, Ning Zhang, Wei Ye, Huanxin Ju, Lei Shi, Ran Long, Junfa Zhu, Yujie Xiong
Z-scheme water splitting is a promising approach based on high-performance photocatalysis by harvesting broadband solar energy. Its efficiency depends on the well-defined interfaces between two semiconductors for the charge kinetics and their exposed surfaces for chemical reactions. Herein, we report a facile cation-exchange approach to obtain compounds with both properties without the need for noble metals by forming Janus-like structures consisting of γ-MnS and Cu7 S4 with high-quality interfaces. The Janus-like γ-MnS/Cu7 S4 structures displayed dramatically enhanced photocatalytic hydrogen production rates of up to 718 μmol g(-1)  h(-1) under full-spectrum irradiation...
March 15, 2017: Angewandte Chemie
Amitava Patra, Arnab Ghosh, Bikash Jana, Sourav Maiti, Rajesh Bera, Hiren Ghosh
Polymer - graphene nanocomposites are promising candidates towards light harvesting systems such as photocatalysis, photovoltaics; where significant charge separation occurs due to photoinduced electron transfer. Much attention has been paid to use reduced graphene oxide (r-GO) as template for anchoring various nanomaterials due to its efficient electron accepting and transport property. Here, we have prepared Poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) nanoparticles from MEH-PPV polymer and investigate the change in photophysical properties due to formation of polymer nanoparticles from molecular state by using steady state and time resolved spectroscopy...
March 14, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Si Wu, James Blinco, Christopher Barner-Kowollik
The majority of photoreactions reported in the literature rely on wavelength within the UV and - to a lesser extent - visible regime for activation, either by directly triggering the reaction or by photocatalysis. However, photoreactions induced by near-infrared (NIR) light are highly attractive for biomedical applications as NIR light can penetrate deeper into tissue and causes less damage to photosensitive biological systems. Recently, upconverting nanoparticles (UCNPs) have been employed by us and others to assist NIR photo-induced reactions...
March 15, 2017: Chemistry: a European Journal
Baoshun Liu, Jingjing Yang, Xiujian Zhao, Jiaguo Yu
In this research, a combination of in situ photoconductivity (σ) and kinetic simulations was used to study the role of electron interfacial transfer (IT) in the gaseous photocatalysis of formic acid by mesoporous nanocrystalline TiO2. The effects of light intensity, initial formic acid concentrations, oxygen amounts, and temperature on the in situ σ and the photocatalytic courses were studied in detail. The temperature dependence of in situ σ clearly shows that the electron transfer is determined by the IT of electrons to O2 rather than by the transport...
March 15, 2017: Physical Chemistry Chemical Physics: PCCP
João P Candido, Sandro J Andrade, Ana L Fonseca, Flávio S Silva, Milady R A Silva, Márcia M Kondo
Emerging contaminants including pharmaceuticals are a class of compounds that are causing great concern due to several environmental problems. Conventional water and wastewater treatments do not achieve high removal efficiencies for many of these drugs. Therefore, the present work investigated the removal of ibuprofen (IBP) by heterogeneous photocatalysis using TiO2 irradiated with artificial UV light or solar radiation. The treated solutions were tested against Daphnia similis and Raphidocelis subcapitata, which are species commonly used as bioindicators of environmental conditions...
March 14, 2017: Environmental Science and Pollution Research International
Yuying Gao, Jian Zhu, Hongyu An, Pengli Yan, Baokun Huang, Ruotian Chen, Fengtao Fan, Can Li
Phase junction is often recognized as an effective strategy to achieve efficient charge separation in photocatalysis and photochemistry. As a crucial factor to determine the photogenerated charges dynamics, there is an increasingly hot debate about the energy band alignment across the interface of phase junction. Herein, we reported the direct measurement of the surface potential profile over the interface of TiO2 phase junction. A built-in electric field up to 1 kV/cm from rutile to anatase nanoparticle was detected by Kelvin Probe Force Microscopy (KPFM)...
March 14, 2017: Journal of Physical Chemistry Letters
Federico Giberti, Márton Vörös, Giulia Galli
Heterogeneous nanostructures, such as quantum dots (QDs) embedded in solid matrices or core-shell nanoparticles, are promising platforms for a wide variety of applications, including phosphors with increased quantum yield, photocatalysis and solar energy conversion. However characterizing and controlling their interfacial morphology and defects, which greatly influence their electronic properties, have proven difficult in numerous cases. Here we carried out atomistic calculations on chalcogenides nanostructured materials, i...
March 13, 2017: Nano Letters
Zhaoyong Lin, Lihua Li, Lili Yu, Weijia Li, Guowei Yang
Realization of hydrogen economy requires an environmental and economic method for hydrogen (H2) evolution. Dual-functional photocatalysis, that is, producing H2 from industrial wastewaters, may be the most ideal. However, it seems almost impossible to achieve dual-functional photocatalysis because of the difficulty in the simultaneous existence of photocatalytic pollutant degradation (PDR) and H2 evolution reactions (HER) in one system. All previous designs show that either HER or PDR is inhibited due to the insufficient management of the photo-generated electrons (e(-)) and holes (h(+))...
March 10, 2017: Physical Chemistry Chemical Physics: PCCP
Yeoseon Choi, Min Seok Koo, Alok D Bokare, Dong-Hyo Kim, Detlef W Bahnemann, Wonyong Choi
We investigated a sequential photocatalysis-dark reaction, wherein organic pollutants were degraded on Ag/TiO2 under UV irradiation and the dark reduction of hexavalent chromium (Cr(VI)) was subsequently followed. The photocatalytic oxidation of 4-chlorophenol (4-CP), a test organic substrate, induced the generation of degradation intermediates and the storage of electrons in Ag/TiO2 which were then utilized for reducing Cr(VI) in the post-irradiation period. The dark reduction efficiency of Cr(VI) was much higher with Ag/TiO2 (87%), compared with bare TiO2 (27%) and Pt/TiO2 (22%)...
March 9, 2017: Environmental Science & Technology
Wenchun Feng, Ji-Young Kim, Xinzhi Wang, Heather A Calcaterra, Zhibei Qu, Louisa Meshi, Nicholas A Kotov
Semiconductors with chiral geometries at the nanoscale and mesoscale provide a rich materials platform for polarization optics, photocatalysis, and biomimetics. Unlike metallic and organic optical materials, the relationship between the geometry of chiral semiconductors and their chiroptical properties remains, however, vague. Homochiral ensembles of semiconductor helices with defined geometries open the road to understanding complex relationships between geometrical parameters and chiroptical properties of semiconductor materials...
March 2017: Science Advances
Sourav Das, Sayantan Sinha, Bhaskar Das, R Jayabalan, Mrutyunjay Suar, Amrita Mishra, Ashok J Tamhankar, Cecilia Stålsby Lundborg, Suraj K Tripathy
Spread of antibiotic resistant bacteria through water, is a threat to global public health. Here, we report Fe-doped ZnO nanoparticles (Fe/ZnO NPs) based solar-photocatalytic disinfection (PCD) of multidrug resistant Escherichia coli (MDR E. coli). Fe/ZnO NPs were synthesized by chemical precipitation technique, and when used as photocatalyst for disinfection, proved to be more effective (time for complete disinfection = 90 min) than ZnO (150 min) and TiO2 (180 min). Lipid peroxidation and potassium (K(+)) ion leakage studies indicated compromisation of bacterial cell membrane and electron microscopy and live-dead staining confirmed the detrimental effects on membrane integrity...
December 2017: Scientific Reports
Songbo Wang, Xiangwen Zhang, Shuai Li, Yuan Fang, Lun Pan, Ji-Jun Zou
ZnO is an important semiconductor and has been widely used in the field of photocatalysis, solar cell and environmental remediation. Herein, we fabricated C-doped ZnO ball-in-ball hollow microspheres (BHMs) by a facile solvothermal treatment of zinc acetate in ethylene glycol-ethanol mixture. The presence of ethylene glycol (EG) leads to the formation of initial single-layered hollow spheres and then a time-dependent evolution transforms them into uniform BHMs with tunable shell thickness and void space. XPS characterizations reveal that C-dopants are introduced into the lattice of ZnO BHMs, with its concentration increasing with solvothermal time and then becoming saturated in 12h...
February 27, 2017: Journal of Hazardous Materials
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