A fast, simple, scalable technique is described for the controlled, solution-based, electrochemical synthesis of patterned metallic and semiconducting nanowires from reusable, nonsacrificial, ultrananocrystalline diamond (UNCD) templates. This enables the repeated fabrication of arrays of complex patterns of nanowires, potentially made of any electrochemically depositable material. Unlike all other methods of patterning nanowires, this benchtop technique quickly mass-produces patterned nanowires whose diameters are not predefined by the template, without requiring intervening vacuum or clean room processing. This technique opens a pathway for studying nanoscale phenomena with minimal equipment, allowing the process-scale development of a new generation of nanowire-based devices.
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http://dx.doi.org/10.1021/am101226w | DOI Listing |
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December 2024
Institute of Physics of the Czech Academy of Sciences, Prague, 16200, Czech Republic.
The miniaturization of electrochemical supercapacitors (EC-SCs) requires electrode materials that are both durable and efficient. Boron-doped diamond (BDD) films are an ideal choice for EC-SC due to their durability and exceptional electrochemical performance. In this study, nanostructured boron-doped ultra-nanocrystalline diamonds (NBUNCD) are fabricated on Si micro-pyramids (Si) using a simple reactive ion etching (RIE) process.
View Article and Find Full Text PDFLangmuir
October 2024
Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea.
In this Perspective, we present the recent advancement and the prospects of atomic-scale friction and adhesion measurements across the between ultrahigh vacuum and ambient pressure environments using variable-pressure atomic force microscopy (VP-AFM). We introduce the VP-AFM that enables nanotribological studies under various gas conditions with partial pressure ranging from UHV (1.0 × 10 mbar) to 1 bar.
View Article and Find Full Text PDFJ Phys Chem B
July 2024
Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States.
The existence of liquid carbon as an intermediate phase preceding the formation of novel carbon materials has been a point of contention for several decades. Experimental observation of such a liquid state requires nonthermal melting of solid carbon materials at various laser fluences and pulse properties. Reflectivity experiments performed in the mid-1980s reached opposing conclusions regarding the metallic or insulating properties of the purported liquid state.
View Article and Find Full Text PDFACS Appl Mater Interfaces
January 2024
School of Physics, The University of Melbourne, Parkville, Victoria 3010, Australia.
This study demonstrates the control of neuronal survival and development using nitrogen-doped ultrananocrystalline diamond (N-UNCD). We highlight the role of N-UNCD in regulating neuronal activity via near-infrared illumination, demonstrating the generation of stable photocurrents that enhance neuronal survival and neurite outgrowth and foster a more active, synchronized neuronal network. Whole transcriptome RNA sequencing reveals that diamond substrates improve cellular-substrate interaction by upregulating extracellular matrix and gap junction-related genes.
View Article and Find Full Text PDFElectrical stimulation is one of several methods for controlling differentiation and proliferation of stem cells. This work demonstrated the use of nitrogen-doped ultra-nanocrystalline diamond (N-UNCD) electrodes as a substrate for the growth of human mesenchymal stem cells (hMSCs). As well as exhibiting a high charge injection capacity, N-UNCD displays high cytocompatibility making it suitable electrode material for stem cell stimulation.
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