Enhancing hot electron generation and injection in the near infrared via rational design and controlled synthesis of TiO2–gold nanostructures

2019 ◽  
Vol 214 ◽  
pp. 341-351 ◽  
Author(s):  
Supriya Atta ◽  
Fuat E. Celik ◽  
Laura Fabris
Keyword(s):  
Rational Design ◽  
Near Infrared ◽  
Gold Nanorod ◽  
Gold Nanostructures ◽  
Design Parameters ◽  
Controlled Synthesis ◽  
Hot Electron ◽  
Electron Generation ◽  
Gold Nanostar ◽  
Important Design

We synthesize TiO2-coated gold nanostar- and gold nanorod-based photocatalysts and identify the most important design parameters for the optimization of hot electron-based photocatalysts.

scholarly journals Nonmetallic plasmonic heterostructures with multi-synergies on boosting hot electron generation for CO2 photoreduction

2021 ◽  
Author(s):  
Zaizhu Lou ◽  
Changhai Lu ◽  
Xinru Li ◽  
Juan Li ◽  
Liang Mao ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Near Infrared ◽  
Photothermal Effect ◽  
Hot Electron ◽  
Hot Carriers ◽  
Tungsten Oxides ◽  
Pyroelectric Effect ◽  
Electron Generation ◽  
Nir Light ◽  
Physical Effects

Abstract Constructing multi-physical effects on semiconductors is one new horizon to develop next-generation photocatalysts. Here we use pyroelectric black phosphorus (BP) to couple with nonmetallic plasmonic tungsten oxides (WO) forming a BP/WO heterostructures as photocatalysts to convert CO2 for CO under visible-near-infrared (Vis-NIR) light irradiation. Nonmetallic plasmonic heterostructures exhibit 26.1 µmol h− 1 g− 1 CO generation with a selectivity of 98 %, and which is 7- and 17-fold higher than those of plasmonic WO and pyroelectric BP, respectively. The interface P-O-W bonds in heterostructures are constructed to work as channels for electron transfer from BP to plasmonic WO. Moreover, the photothermal energy generated by SPR excitation on WO can make the temperature of heterostructures rapidly increasing from 24 to 86 oC in 10 min, triggering the pyroelectric BP for carriers to promote electron transfer. Multi-physical effects including plasmonic hot carriers and photothermal effect of WO, intrinsic band excitation and pyroelectric effect of BP and W-O-P bonds play synergistic roles on boosting hot electron generation for CO2 reduction. This work provides clear proofs to demonstrate that constructing multi-physical effects on semiconductors is one useful strategy to promote NIR-harvesting for artificial photosynthesis.

Plasmon induced hot electron generation in two dimensional carbonaceous nanosheets decorated with Au nanostars: enhanced photocatalytic activity under visible light

2021 ◽  
Author(s):  
Ajay Kumar ◽  
Priyanka Choudhary ◽  
Kamlesh Kumar ◽  
Ashish Kumar ◽  
Venkata Krishnan
Keyword(s):  
Photocatalytic Activity ◽  
Solar Energy ◽  
Visible Light ◽  
Rational Design ◽  
Two Dimensional ◽  
Hot Electron ◽  
Efficient Utilization ◽  
Design And Development ◽  
Electron Generation ◽  
Photocatalytic Applications

Rational design and development of photocatalytic materials is of paramount importance for efficient utilization of solar energy in photocatalytic applications.

One-step controlled synthesis of anisotropic gold nanostructures with aniline as the reductant in aqueous solution

2007 ◽  
Vol 309 (2) ◽  
pp. 518-523 ◽  
Author(s):  
Zhirui Guo ◽  
Yu Zhang ◽  
Lan Huang ◽  
Meng Wang ◽  
Jing Wang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Gold Nanostructures ◽  
Controlled Synthesis ◽  
One Step

scholarly journals Real-time observation of tetrapyrrole binding to an engineered bacterial phytochrome

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Yusaku Hontani ◽  
Mikhail Baloban ◽  
Francisco Velazquez Escobar ◽  
Swetta A. Jansen ◽  
Daria M. Shcherbakova ◽  
...  
Keyword(s):  
Real Time ◽  
Rational Design ◽  
Near Infrared ◽  
Fluorescent Proteins ◽  
Covalent Bond ◽  
Binding Pocket ◽  
Tissue Imaging ◽  
Covalent Attachment ◽  
Time Resolved

AbstractNear-infrared fluorescent proteins (NIR FPs) engineered from bacterial phytochromes are widely used for structural and functional deep-tissue imaging in vivo. To fluoresce, NIR FPs covalently bind a chromophore, such as biliverdin IXa tetrapyrrole. The efficiency of biliverdin binding directly affects the fluorescence properties, rendering understanding of its molecular mechanism of major importance. miRFP proteins constitute a family of bright monomeric NIR FPs that comprise a Per-ARNT-Sim (PAS) and cGMP-specific phosphodiesterases - Adenylyl cyclases - FhlA (GAF) domain. Here, we structurally analyze biliverdin binding to miRFPs in real time using time-resolved stimulated Raman spectroscopy and quantum mechanics/molecular mechanics (QM/MM) calculations. Biliverdin undergoes isomerization, localization to its binding pocket, and pyrrolenine nitrogen protonation in <1 min, followed by hydrogen bond rearrangement in ~2 min. The covalent attachment to a cysteine in the GAF domain was detected in 4.3 min and 19 min in miRFP670 and its C20A mutant, respectively. In miRFP670, a second C–S covalent bond formation to a cysteine in the PAS domain occurred in 14 min, providing a rigid tetrapyrrole structure with high brightness. Our findings provide insights for the rational design of NIR FPs and a novel method to assess cofactor binding to light-sensitive proteins.

scholarly journals Controlled synthesis of dendritic gold nanostructures by graphene oxide and their morphology-dependent performance for iron detection in coastal waters

RSC Advances ◽  
2017 ◽  
Vol 7 (26) ◽  
pp. 15833-15841 ◽  
Author(s):  
Haitao Han ◽  
Dawei Pan ◽  
Chenchen Wang ◽  
Rilong Zhu
Keyword(s):  
Graphene Oxide ◽  
Coastal Waters ◽  
Voltammetric Determination ◽  
Gold Nanostructures ◽  
Controlled Synthesis

Dendritic gold nanostructures were controllably synthesized by graphene oxide for voltammetric determination of Fe(iii) in coastal waters.

scholarly journals Near-infrared photothermal therapy using anti-EGFR-gold nanorod conjugates for triple negative breast cancer

Oncotarget ◽  
2017 ◽  
Vol 8 (49) ◽  
pp. 86566-86575 ◽  
Author(s):  
Meihua Zhang ◽  
Hoe Suk Kim ◽  
Tiefeng Jin ◽  
Jisu Woo ◽  
Yin Ji Piao ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Triple Negative Breast Cancer ◽  
Photothermal Therapy ◽  
Near Infrared ◽  
Triple Negative ◽  
Gold Nanorod

scholarly journals ON THE ISSUE OF DETERMINING THE CRITICAL CUTTING SPEED OF THE MECHANISM FOR FORMING AND TRIMMING THE FALSE EDGE OF THE DORNIER RAPIER LOOM

2021 ◽  
Vol 53 (3) ◽  
pp. 37-40
Author(s):  
Svitlana V. Bukina ◽  
Tatiana A. Sitnikova
Keyword(s):  
Rational Design ◽  
Mutual Influence ◽  
Cutting Speed ◽  
Design Parameters ◽  
Working Process ◽  
Forming Mechanism ◽  
Rational Design Parameters ◽  
Calculation Results ◽  
Knife Blade ◽  
The Impact

In this paper, an attempt is made to develop a method for determining the critical cutting speed of the threads of the false edge of the edge-forming mechanism of the weaving rapier machine. The proposed calculation method takes into account the impact nature of the cutting process at a critical speed, which allows taking into account the mutual influence of the parameters of the working process and more fully assess the mechanics of this process, in which the intensity of the cutting force and the value of the contact stress take the maximum value. The paper calculates the critical cutting speed for some of the main types of threads used and the parameters of the knife blade. The presented calculation results can be used to select rational design parameters of the knife blade, depending on the type of processed threads, when designing and researching new edge-forming mechanisms on looms.

scholarly journals SUBSTANTIATION OF THE FORM AND DETERMINATION OF THE CONSTRUCTIVE PARAMETERS OF THE ROTATION ROLLER OF SOIL

2018 ◽  
Vol 13 (3) ◽  
pp. 72-76
Author(s):  
Гумар Булгариев ◽  
Gumar Bulgariev ◽  
Геннадий Пикмуллин ◽  
Gennadiy Pikmullin ◽  
Ильгиз Галиев ◽  
...  
Keyword(s):  
Analytical Study ◽  
Point Of View ◽  
Design Parameters ◽  
Industrial Complex ◽  
Stage Of Development ◽  
Pass Through ◽  
Spiral Plate ◽  
Working Device ◽  
Important Design

At the present stage of development of the country’s agro-industrial complex, the technological process of surface tillage by combined soil-cultivating machines, simultaneously combining a number of operations in one pass through the field, causes the presence in their designs of the necessary set of various promising working organs. In view of the foregoing, a rotary soil ripper with a spiral-plate working member equipped with radially directed teeth and connected by means of rods with end flanges has been developed. Also, the researched ripper has the limits of penetration of the working element in the form of flat discs equipped with flanges and the radial stop have the ability to rotate around their axes independently of the ripper shaft. An analytical study of the working units of this ripper was carried out from the point of view of the influence of their size and teeth on the process of interaction with the soil, on the basis of which some of their parameters were determined. In conclusion, it was concluded that the analytical equations obtained allow us to justify the choice of the most important design parameters of the proposed new design and design a toothed rotary working device that reduces to constructive implementation after calculating their basic dimensions.

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