Self-assembly of silica colloidal crystal thin films with tuneable structural colours over a wide visible spectrum

AbstractDye-sensitized zinc oxide thin films were prepared, characterized and optimized for applications as photoelectrochemically active electrodes. Conditions were established under which crystalline thin films of ZnO with a porous texture were formed by electrochemically induced crystallization controlled by structure-directing agents (SDA). Dye molecules were adsorbed either directly as SDA during this preparation step or, preferably, following desorption of a SDA. The external quantum efficiency (IPCE) could thereby be increased significantly. Particular emphasis was laid on dye molecules that absorb in the red part of the visible spectrum. Model experiments under ultrahigh vacuum (UHV) conditions with dye molecules adsorbed on defined crystal planes of single crystals aimed at a deeper understanding of the coupling of the chromophore electronic π-system within molecular aggregates and to the semiconductor surface. Detailed photoelectrochemical kinetic measurements were used to characterize and optimize the electrochemically prepared dye-sensitized ZnO films. Parallel electrical characterization in vacuum served to distinguish between contributions of charge transport within the ZnO semiconductor matrix and the ions of the electrolyte in the pore system of the electrode.

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Colloidal Crystal Thin Films with Square Lattice Nanoprotrusions Formed by Self‐Assembly via Spin‐Coating and Heating

ChemistrySelect ◽

10.1002/slct.202102835 ◽

2021 ◽

Vol 6 (37) ◽

pp. 9920-9925

Author(s):

Goshi Kuno ◽

Kota Sakaguchi ◽

Akikazu Matsumoto

Keyword(s):

Thin Films ◽

Self Assembly ◽

Spin Coating ◽

Colloidal Crystal ◽

Square Lattice

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Rapid fabrication of a large-area 3D silica colloidal crystal thin film by a room temperature floating self-assembly method

Materials Letters ◽

10.1016/j.matlet.2009.04.024 ◽

2009 ◽

Vol 63 (18-19) ◽

pp. 1586-1589 ◽

Cited By ~ 28

Author(s):

Aijun Wang ◽

Sheng-Li Chen ◽

Peng Dong

Keyword(s):

Thin Film ◽

Self Assembly ◽

Room Temperature ◽

Colloidal Crystal ◽

Large Area ◽

Assembly Method ◽

Rapid Fabrication ◽

Silica Colloidal Crystal

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High Performance Thermoelectric Materials Using Solution Phase Synthesis of Narrow Bandgap Core/Shell Quantum Dots Deposited Into Colloidal Crystal Thin Films

10.21236/ada434970 ◽

2005 ◽

Author(s):

EVIDENT TECHNOLOGIES TROY NY

Keyword(s):

Thin Films ◽

Quantum Dots ◽

Thermoelectric Materials ◽

High Performance ◽

Colloidal Crystal ◽

Solution Phase ◽

Core Shell ◽

Phase Synthesis ◽

Solution Phase Synthesis ◽

Narrow Bandgap

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Nanoscratch-Directed Self-Assembly of Block Copolymer Thin Films

ACS Applied Materials & Interfaces ◽

10.1021/acsami.0c19665 ◽

2021 ◽

Vol 13 (4) ◽

pp. 5772-5781

Author(s):

Dong Hyup Kim ◽

Ahram Suh ◽

Geonhyeong Park ◽

Dong Ki Yoon ◽

So Youn Kim

Keyword(s):

Thin Films ◽

Block Copolymer ◽

Self Assembly

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nnEngineering coumarin-BODIPY thin-films and molecular crystals: tailoring supramolecular self-assembly for organic electronic applications

Journal of Molecular Structure ◽

10.1016/j.molstruc.2021.130437 ◽

2021 ◽

pp. 130437

Author(s):

Javier Ordóñez-Hernández ◽

Rafael Arcos-Ramos ◽

Violeta Alvarez-Venicio ◽

Vladimir A. Basiuk ◽

Oscar González-Antonio ◽

...

Keyword(s):

Thin Films ◽

Self Assembly ◽

Molecular Crystals ◽

Organic Electronic

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Strain-Relief Patterns and Kagome Lattice in Self-Assembled C60 Thin Films Grown on Cd(0001)

International Journal of Molecular Sciences ◽

10.3390/ijms22136880 ◽

2021 ◽

Vol 22 (13) ◽

pp. 6880

Author(s):

Zilong Wang ◽

Minlong Tao ◽

Daxiao Yang ◽

Zuo Li ◽

Mingxia Shi ◽

...

Keyword(s):

Thin Films ◽

Self Assembly ◽

High Vacuum ◽

Ultra High Vacuum ◽

Scanning Tunneling ◽

Kagome Lattice ◽

Tunneling Microscopy ◽

Kagomé Lattice ◽

Temperature Scanning ◽

C60 Films

We report an ultra-high vacuum low-temperature scanning tunneling microscopy (STM) study of the C60 monolayer grown on Cd(0001). Individual C60 molecules adsorbed on Cd(0001) may exhibit a bright or dim contrast in STM images. When deposited at low temperatures close to 100 K, C60 thin films present a curved structure to release strain due to dominant molecule–substrate interactions. Moreover, edge dislocation appears when two different wavy structures encounter each other, which has seldomly been observed in molecular self-assembly. When growth temperature rose, we found two forms of symmetric kagome lattice superstructures, 2 × 2 and 4 × 4, at room temperature (RT) and 310 K, respectively. The results provide new insight into the growth behavior of C60 films.

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