Potential Driven Non-Reactive Phase Transitions of Ordered Porphyrin Molecules on Iodine-Modified Au(100): An Electrochemical Scanning Tunneling Microscopy (EC-STM) Study
Abstract
:1. Introduction
2. Materials and Methods
- for the base vector of the Au(100) lattice (x = 1,2);
- and for the base vectors of the iodine lattice (x = 1,2); and,
- ,, , and for the base vectors of the porphyrin phases PI–PV (x = 1,2).
3. Results and Discussion
3.1. Cyclic Voltammetry and H2TMPyP Structures
3.2. Electrode Potential Stability of H2TMPyP Phases on I/Au(100)
3.3. Substrate-Adlayer Structure Correlations
3.3.1. Phases PI, PIII
3.3.2. Phases PIII, PIV
4. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Parameter | PI | PII | PIII | PIV | PV |
---|---|---|---|---|---|
lattice constants [±0.05 nm] | c1 = 1.61 c2 = 1.80 | d1= 1.94 d2 = 1.56 | e1 = 1.61 e2 = 2.06 | f1 = 1.94 f2 = 1.76 | g1 = 1.46 g2 = 2.06 |
angle [±1°] | 92° | 74° | 89° | 77° | 85° |
molecule rotation [α ±1°] | +30° vs. | −28° vs. | +32° vs. | +26° vs. | +27° vs. |
surface concentration [molecules/cm2] | 3.453 × 1013 | 3.437 × 1013 | 3.016 × 1013 | 3.014 × 1013 | 3.333 × 1013 |
Parameter | PI | PIII | PIV | |
---|---|---|---|---|
Au lattice parameters | vectors direction | | ||
lattice constant | a1 = 0.289 nm a2 = 0.289 nm | |||
Iodine lattice parameters | vectors direction | | | |
lattice constant | b1 = 0.404 nm b2 = 0.410 nm | b′1 = 0.388 nm b′2 = 0.439 nm | b′1 = 0.388 nm b′2 = 0.439 nm | |
Θ* | 0.52 ML | 0.50 ML | 0.50 ML | |
Matrix with respect to Au(100) | ||||
Porphyrins lattice parameters | vectors direction | | | |
Θ* | 0.0286 ML | 0.0250 ML | 0.0250 ML | |
Matrix with respect to iodine | ||||
Matrix with respect to Au(100) |
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Kosmala, T.; Blanco, M.; Granozzi, G.; Wandelt, K. Potential Driven Non-Reactive Phase Transitions of Ordered Porphyrin Molecules on Iodine-Modified Au(100): An Electrochemical Scanning Tunneling Microscopy (EC-STM) Study. Surfaces 2018, 1, 12-28. https://doi.org/10.3390/surfaces1010003
Kosmala T, Blanco M, Granozzi G, Wandelt K. Potential Driven Non-Reactive Phase Transitions of Ordered Porphyrin Molecules on Iodine-Modified Au(100): An Electrochemical Scanning Tunneling Microscopy (EC-STM) Study. Surfaces. 2018; 1(1):12-28. https://doi.org/10.3390/surfaces1010003
Chicago/Turabian StyleKosmala, Tomasz, Matías Blanco, Gaetano Granozzi, and Klaus Wandelt. 2018. "Potential Driven Non-Reactive Phase Transitions of Ordered Porphyrin Molecules on Iodine-Modified Au(100): An Electrochemical Scanning Tunneling Microscopy (EC-STM) Study" Surfaces 1, no. 1: 12-28. https://doi.org/10.3390/surfaces1010003