Surface area and pore size characteristics of nanoporous gold subjected to thermal, mechanical, or surface modification studied using gas adsorption isotherms, cyclic voltammetry, thermogravimetric analysis, and scanning electron microscopy
Yih Horng Tan,Jason A. Davis,Kohki Fujikawa,N. Vijaya Ganesh,Alexei V. Demchenko,Keith J. Stine +5 more
Reads0
Chats0
TLDR
The study highlights the ability to control free-standing nanoporous gold monoliths with high surface area, and well-defined, tunable pore morphology.Abstract:
Nitrogen adsorption/desorption isotherms are used to investigate the Brunauer, Emmett, and Teller (BET) surface area and Barrett-Joyner-Halenda (BJH) pore size distribution of physically modified, thermally annealed, and octadecanethiol functionalized np-Au monoliths. We present the full adsorption-desorption isotherms for N2 gas on np-Au, and observe type IV isotherms and type H1 hysteresis loops. The evolution of the np-Au under various thermal annealing treatments was examined using scanning electron microscopy (SEM). The images of both the exterior and interior of the thermally annealed np-Au show that the porosity of all free standing np-Au structures decreases as the heat treatment temperature increases. The modification of the np-Au surface with a self-assembled monolayer (SAM) of C18-SH (coverage of 2.94 × 1014 molecules cm−2 based from the decomposition of the C18-SH using thermogravimetric analysis (TGA)), was found to reduce the strength of the interaction of nitrogen gas with the np-Au surface, as reflected by a decrease in the ‘C’ parameter of the BET equation. From cyclic voltammetry studies, we found that the surface area of the np-Au monoliths annealed at elevated temperatures followed the same trend with annealing temperature as found in the BET surface area study and SEM morphology characterization. The study highlights the ability to control free-standing nanoporous gold monoliths with high surface area, and well-defined, tunable pore morphology.read more
Citations
More filters
Journal ArticleDOI
One-step synthesis of zero-dimensional hollow nanoporous gold nanoparticles with enhanced methanol electrooxidation performance
Srikanth Pedireddy,Hiang Kwee Lee,Weng Weei Tjiu,In Yee Phang,Hui Ru Tan,Shu Quan Chua,Cedric Troadec,Xing Yi Ling +7 more
TL;DR: A one-step solution phase synthesis of zero-dimensional hollow nanoporous gold nanoparticles with tunable particle size and ligament thickness reveals the crucial heteroepitaxial growth of gold on the surface of silver chloride templates, implying that the synthetic protocol is generic and may be extended to the synthesis of other nanoporous metals via different templates.
Journal ArticleDOI
Automated Chemical Oligosaccharide Synthesis: Novel Approach to Traditional Challenges.
TL;DR: The overarching goal of this review article is to present the advances that have been made at the interface of carbohydrate chemistry and automated technology.
Journal ArticleDOI
Mesoporous Ni60Fe30Mn10-alloy based metal/metal oxide composite thick films as highly active and robust oxygen evolution catalysts
Eric Detsi,John B. Cook,Benjamin K. Lesel,Christopher L. Turner,Yu-Lun Liang,Shauna Robbennolt,Sarah H. Tolbert +6 more
TL;DR: A robust nanostructured porous NiFe-based oxygen evolution catalyst made by selective alloy corrosion is reported on, which exhibits a catalytic activity towards water oxidation of 500 mA/cm2 at 360 mV overpotential and is stable for over eleven days.
Journal ArticleDOI
Covalent Self-Assembly in Two Dimensions: Connecting Covalent Organic Framework Nanospheres into Crystalline and Porous Thin Films
Himadri Sekhar Sasmal,Arjun Halder,Shebeeb Kunjattu H,Kaushik Dey,Athulya Nadol,Thalasseril G. Ajithkumar,Prachiti R. Bedadur,Rahul Banerjee +7 more
TL;DR: This work proposes a unique way to make uniform, solution-processable crystalline, and porous COF nanospheres directly from the homogeneous solution of amine and aldehyde via spatial and temporal control of the nu-cleation and growth.
Journal ArticleDOI
Toward digitally controlled catalyst architectures: Hierarchical nanoporous gold via 3D printing
Cheng Zhu,Zhen Qi,Victor A. Beck,Mathilde Luneau,Judith Lattimer,Wen Chen,Marcus A. Worsley,Jianchao Ye,Eric B. Duoss,Christopher M. Spadaccini,Cynthia M. Friend,Juergen Biener +11 more
TL;DR: 3D (three-dimensional)–printed hierarchical nanoporous gold with engineered nonrandom macroarchitectures with the potential to revolutionize the design of (electro-)chemical plants by changing the scaling relations between volume and catalyst surface area.
References
More filters
Journal ArticleDOI
Adsorption of Gases in Multimolecular Layers
Journal ArticleDOI
Reporting physisorption data for gas/solid systems with special reference to the determination of surface area and porosity (Recommendations 1984)
TL;DR: Mise au point comportant des definitions generales et la terminologie, la methodologie utilisee, les procedes experimentaux, les interpretations des donnees d'adsorption, les determinations de l'aire superficielle, and les donnes sur la mesoporosite et la microporosite.
Journal ArticleDOI
Formation and Structure of Self-Assembled Monolayers.
TL;DR: Monolayers of alkanethiolates on gold are probably the most studied SAMs to date and offer the needed design flexibility, both at the individual molecular and at the material levels, and offer a vehicle for investigation of specific interactions at interfaces, and of the effect of increasing molecular complexity on the structure and stability of two-dimensional assemblies.
Journal ArticleDOI
Evolution of nanoporosity in dealloying
Jonah Erlebacher,Jonah Erlebacher,Michael J. Aziz,Alain Karma,Nikolay Dimitrov,Karl Sieradzki +5 more
TL;DR: It is demonstrated that nanoporosity in metals is due to an intrinsic dynamical pattern formation process, and that chemically tailored nanoporous gold made by dealloying Ag-Au should be suitable for sensor applications, particularly in a biomaterials context.
Related Papers (5)
Nanoporous Gold Leaf: “Ancient Technology”/Advanced Material
Ultrafine nanoporous gold by low-temperature dealloying and kinetics of nanopore formation
Lihua Qian,Mingwei Chen +1 more