Dynamics and Equilibrium for Single Step Hole Transport Processes in Duplex DNA

Author(s):  
Frederick D. Lewis ◽  
Michael R. Wasielewski
2015 ◽  
Vol 25 (43) ◽  
pp. 6802-6813 ◽  
Author(s):  
Pichaya Pattanasattayavong ◽  
Alexander D. Mottram ◽  
Feng Yan ◽  
Thomas D. Anthopoulos

2020 ◽  
Vol 118 (2) ◽  
pp. e2014139118
Author(s):  
Catharine Shipps ◽  
H. Ray Kelly ◽  
Peter J. Dahl ◽  
Sophia M. Yi ◽  
Dennis Vu ◽  
...  

Proteins are commonly known to transfer electrons over distances limited to a few nanometers. However, many biological processes require electron transport over far longer distances. For example, soil and sediment bacteria transport electrons, over hundreds of micrometers to even centimeters, via putative filamentous proteins rich in aromatic residues. However, measurements of true protein conductivity have been hampered by artifacts due to large contact resistances between proteins and electrodes. Using individual amyloid protein crystals with atomic-resolution structures as a model system, we perform contact-free measurements of intrinsic electronic conductivity using a four-electrode approach. We find hole transport through micrometer-long stacked tyrosines at physiologically relevant potentials. Notably, the transport rate through tyrosines (105 s−1) is comparable to cytochromes. Our studies therefore show that amyloid proteins can efficiently transport charges, under ordinary thermal conditions, without any need for redox-active metal cofactors, large driving force, or photosensitizers to generate a high oxidation state for charge injection. By measuring conductivity as a function of molecular length, voltage, and temperature, while eliminating the dominant contribution of contact resistances, we show that a multistep hopping mechanism (composed of multiple tunneling steps), not single-step tunneling, explains the measured conductivity. Combined experimental and computational studies reveal that proton-coupled electron transfer confers conductivity; both the energetics of the proton acceptor, a neighboring glutamine, and its proximity to tyrosine influence the hole transport rate through a proton rocking mechanism. Surprisingly, conductivity increases 200-fold upon cooling due to higher availability of the proton acceptor by increased hydrogen bonding.


2012 ◽  
Vol 190-191 ◽  
pp. 43-52
Author(s):  
Chao Yang ◽  
Guo Gang Yang ◽  
Dan Ting Yue ◽  
Jin Liang Yuan

Solid oxide fuel cell (SOFC) is one of most promising types of fuel cells with advantages of high efficiencies, flexible fuel types. As a device directly converting the free energy of chemical reactant to electrical energy and heat, the performance of SOFC is strongly affected by the chemical and electro-chemical reactions occurring in the porous anode coupled with mass, momentum and heat transfer processes. A 3D CFD model has been developed by using in-house code to analyze the various processes coupled with elementary surface reactions occurring in SOFC’s anode, to identify the effects between transfer processes and some elementary reactions occurring in the anode. It shows that single step elementary reaction can affect the distribution of surface species, but not remarkable on global conditions such as temperature and gas distribution. On the other hand, global parameters including temperature, porous characteristics affect the surface species distribution and elementary reaction processes largely.


ACS Omega ◽  
2021 ◽  
Vol 6 (7) ◽  
pp. 4574-4581
Author(s):  
Atreyo Mukherjee ◽  
Dragica Vasileska ◽  
John Akis ◽  
Amir H. Goldan

2018 ◽  
Vol 5 (5) ◽  
pp. 172158 ◽  
Author(s):  
Daniel Burkitt ◽  
Justin Searle ◽  
Trystan Watson

The fabrication of perovskite solar cells in an N-I-P structure with compact titanium dioxide blocking, mesoporous titanium dioxide scaffold, single-step perovskite and hole-transport layers deposited using the slot-die coating technique is reported. Devices on fluorine-doped tin oxide-coated glass substrates with evaporated gold top contacts and four slot-die-coated layers are demonstrated, and best cells reach stabilized power conversion efficiencies of 7%. This work demonstrates the suitability of slot-die coating for the production of layers within this perovskite solar cell stack and the potential to transfer to large area and roll-to-roll manufacturing processes.


Molecules ◽  
2021 ◽  
Vol 26 (24) ◽  
pp. 7680
Author(s):  
Ramanaskanda Braveenth ◽  
Keunhwa Kim ◽  
Il-Ji Bae ◽  
Kanthasamy Raagulan ◽  
Bo Mi Kim ◽  
...  

Two small molecular hole-transporting type materials, namely 4-(9,9-dimethylacridin-10(9H)-yl)-N-(4-(9,9-dimethylacridin-10(9H)-yl)phenyl)-N-phenylaniline (TPA-2ACR) and 10,10′-(9-phenyl-9H-carbazole-3,6-diyl)bis(9,9-dimethyl-9,10-dihydroacridine) (PhCAR-2ACR), were designed and synthesized using a single-step Buchwald–Hartwig amination between the dimethyl acridine and triphenylamine or carbazole moieties. Both materials showed high thermal decomposition temperatures of 402 and 422 °C at 5% weight reduction for PhCAR-2ACR and TPA-2ACR, respectively. TPA-2ACR as hole-transporting material exhibited excellent current, power, and external quantum efficiencies of 55.74 cd/A, 29.28 lm/W and 21.59%, respectively. The achieved device efficiencies are much better than that of the referenced similar, 1,1-Bis[(di-4-tolylamino)phenyl]cyclohexane (TAPC)-based device (32.53 cd/A, 18.58 lm/W and 10.6%). Moreover, phenyl carbazole-based PhCAR-2ACR showed good device characteristics when applied for host material in phosphorescent OLEDs.


Author(s):  
Atreyo Mukherjee ◽  
Richard Akis ◽  
Dragica Vasileska ◽  
Amirhossein H. Goldan

2003 ◽  
Vol 125 (16) ◽  
pp. 4850-4861 ◽  
Author(s):  
Frederick D. Lewis ◽  
Jianqin Liu ◽  
Xiaobing Zuo ◽  
Ryan T. Hayes ◽  
Michael R. Wasielewski

2003 ◽  
Vol 107 (18) ◽  
pp. 3525-3537 ◽  
Author(s):  
Robert N. Barnett ◽  
Charles L. Cleveland ◽  
Uzi Landman ◽  
Edna Boone ◽  
Sriram Kanvah ◽  
...  

Sign in / Sign up

Export Citation Format

Share Document