Polar zinc oxide surface in electrolyte solutions; an atomic view of reconstruction, hydration and surface states

2021 ◽  
Author(s):  
Yudai Samejima ◽  
Naritaka Kobayashi ◽  
Sei-ichiro Nakabayashi
Keyword(s):  
Electrochemical Method ◽  
Ph Dependence ◽  
Surface States ◽  
Electrolyte Solutions ◽  
Atomic Resolution ◽  
Oxide Surface ◽  
Stabilization Mechanism ◽  
Liquid Environment ◽  
Force Microscopy ◽  
Atomic Force

Stabilization mechanism of the Zn-terminated (Zn-) ZnO(0001) surface in electrolyte solutions has been investigated by using atomic-resolution liquid-environment atomic force microscopy (AFM) and electrochemical method. Electrochemically measured pH dependence of...

scholarly journals Improvements in fundamental performance of liquid-environment atomic force microscopy with true atomic resolution

2015 ◽  
Vol 54 (8S2) ◽  
pp. 08LA03 ◽  
Author(s):  
Kazuki Miyata ◽  
Keisuke Miyazawa ◽  
Seyed Mohammad Reza Akrami ◽  
Takeshi Fukuma
Keyword(s):  
Atomic Force Microscopy ◽  
Atomic Resolution ◽  
Liquid Environment ◽  
Force Microscopy ◽  
Atomic Force

Atomic Resolution Imaging on Si(100)2×1 and Si(100)2×1:H Surfaces with Noncontact Atomic Force Microscopy

2000 ◽  
Vol 39 (Part 2, No. 2A) ◽  
pp. L113-L115 ◽  
Author(s):  
Kousuke Yokoyama ◽  
Taketoshi Ochi ◽  
Akira Yoshimoto ◽  
Yasuhiro Sugawara ◽  
Seizo Morita
Keyword(s):  
Atomic Force Microscopy ◽  
Atomic Resolution ◽  
Force Microscopy ◽  
Atomic Force ◽  
Resolution Imaging

Influence of surface passivation on electric properties of individual GaAs nanowires studied by current–voltage AFM measurements

2016 ◽  
Vol 56 (2) ◽  
Author(s):  
Pavel Geydt ◽  
Prokhor A. Alekseev ◽  
Mikhail S. Dunaevskiy ◽  
Tuomas Haggrén ◽  
Joona-Pekko Kakko ◽  
...  
Keyword(s):  
Vertical Structure ◽  
Surface Passivation ◽  
Surface States ◽  
Electric Properties ◽  
Conductive Atomic Force Microscopy ◽  
Force Microscopy ◽  
Atomic Force ◽  
Gaas Nanowires ◽  
Current Voltage

Current–voltage (I–V) characteristics of vertical p-GaAs nanowires (NWs) covered by different surface passivation materials were experimentally measured by conductive atomic force microscopy (C-AFM). The obtained I–V curves for individual NWs with a diameter of 100 nm covered with AlGaAs, GaN, GaP or InP shell layers were compared to analyse the influence of surface passivation on the density of surface states and choose the most beneficial passivating material for technological applications. We have found the absence of a Schottky barrier between the golden catalytic cap on the top of a NW and the nanowire situated below and covered with an ultrathin GaP passivating layer. It was suggested that passivating material can arrange the heterostructure configuration with the GaAs NW near the Au cap. The latter mechanism was proposed to explain a strong energy barrier found in nanowires covered with InP passivation. AlGaAs passivation affected the forward threshold voltage of nanowires for NWs, which was measured simultaneously with the resistivity of each individual vertical structure from an array by means of AFM in the regime of measuring the I–V curves and onefold calculations. We made an attempt to develop the methodology of measurement and characterization of electric properties of passivated NWs.

scholarly journals pH-depended protein shell dis- and reassembly of ferritin nanoparticles revealed by atomic force microscopy

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Lukas Stühn ◽  
Julia Auernhammer ◽  
Christian Dietz
Keyword(s):  
Atomic Force Microscopy ◽  
Ph Value ◽  
Surrounding Medium ◽  
Real Space ◽  
Iron Storage ◽  
Liquid Environment ◽  
Force Microscopy ◽  
Atomic Force ◽  
Dependent Change ◽  
Protein Shell

AbstractFerritin, a protein that is present in the human body for a controlled iron storage and release, consists of a ferrihydrite core and a protein shell. Apoferritin, the empty shell of ferritin, can be modified to carry tailored properties exploitable for targeted and direct drug delivery. This protein shell has the ability to dis- and reassemble depending on the pH value of the liquid environment and can thus be filled with the desired substance. Here we observed the dis- and reassembly process of the protein shell of ferritin and apoferritin in situ and in real space using atomic force microscopy. Ferritin and apoferritin nanoparticles adsorbed on a mica substrate exhibited a change in their size by varying the pH value of the surrounding medium. Lowering the pH value of the solution led to a decrease in size of the nanoparticles whereas a successive increase of the pH value increased the particle size again. The pH dependent change in size could be related to the dis- and reassembling of the protein shell of ferritin and apoferritin. Supplementary imaging by bimodal magnetic force microscopy of ferritin molecules accomplished in air revealed a polygonal shape of the core and a three-fold symmetry of the protein shell providing valuable information about the substructure of the nanoparticles.

scholarly journals High viscosity environments: an unexpected route to obtain true atomic resolution with atomic force microscopy

2014 ◽  
Vol 25 (17) ◽  
pp. 175701 ◽  
Author(s):  
Stefan A L Weber ◽  
Jason I Kilpatrick ◽  
Timothy M Brosnan ◽  
Suzanne P Jarvis ◽  
Brian J Rodriguez
Keyword(s):  
Atomic Force Microscopy ◽  
High Viscosity ◽  
Atomic Resolution ◽  
Force Microscopy ◽  
Atomic Force
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