Related Experiment Video
Updated: Feb 10, 2026
05:28
Versatile Technique to Produce a Hierarchical Design in Nanoporous Gold
Published on: February 10, 2023
2.2K
Single nanoporous gold nanowire sensors
1Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA.
The Journal of Physical Chemistry. B
|March 3, 2006
Summary
Researchers fabricated single nanoporous gold nanowires to detect chemical adsorption. This novel sensor material shows a resistance change upon alkanethiol adsorption, enabling real-time monitoring.
Area of Science:
- Materials Science
- Nanotechnology
- Surface Chemistry
Background:
- Chemisorption in metallic materials with dimensions smaller than the electron mean free path can alter electrical resistance.
- Nanoporous metals offer a high surface area-to-volume ratio, making them promising for sensing applications.
Purpose of the Study:
- To fabricate single nanoporous gold nanowires for chemical sensing.
- To demonstrate real-time monitoring of alkanethiol adsorption on these nanowires.
Main Methods:
- Fabrication of single nanoporous gold nanowires via in situ etching of Au-Ag alloy nanowires.
- Characterization of porous structure evolution by monitoring resistance changes and cross-sectional imaging.
- Real-time detection of octadecanethiol monolayer adsorption via resistance measurements.
Main Results:
- Successful fabrication of ~10 nm feature size nanoporous gold nanowires.
- Observed a 3% resistance change upon adsorption of an octadecanethiol monolayer.
- Achieved a sensitivity factor of 1.0x10^-16 cm^2, comparable to ultrathin films.
Conclusions:
- Single nanoporous gold nanowires are effective platforms for detecting gas or liquid phase chemisorption.
- The high surface scattering in these nanowires enhances sensitivity to surface adsorption events.
- This demonstrates a viable method for real-time monitoring of molecular adsorption at the nanoscale.
Related Concept Videos
01:29Load along a Single Axis
648
In structural engineering, the analysis of beams subjected to varying loads is a critical aspect of understanding the behavior and performance of these structural elements. A common scenario involves a beam subjected to a combination of different load distributions.
Consider a beam of length L subjected to a varying load, which is a combination of parabolic and trapezoidal load distribution along the x-axis. In this case, it is essential to determine the resultant loads, their locations, and...
Consider a beam of length L subjected to a varying load, which is a combination of parabolic and trapezoidal load distribution along the x-axis. In this case, it is essential to determine the resultant loads, their locations, and...
648
01:24Single Pipe Systems
462
In pipe flow analysis, problems are typically categorized into three types — Type I, Type II, and Type III — based on the known parameters and the desired outcome. Each type of problem addresses specific engineering requirements using fluid properties, pipe characteristics, and operational conditions.
In a Type I problem, fluid properties (density and viscosity), pipe characteristics (including diameter, length, and surface roughness), and the flow rate or average velocity are...
In a Type I problem, fluid properties (density and viscosity), pipe characteristics (including diameter, length, and surface roughness), and the flow rate or average velocity are...
462
01:10Angular Momentum: Single Particle
7.8K
Angular momentum is directed perpendicular to the plane of the rotation, and its magnitude depends on the choice of the origin. The perpendicular vector joining the linear momentum vector of an object to the origin is called the “lever arm.” If the lever arm and linear momentum are collinear, then the magnitude of the angular momentum is zero. Therefore, in this case, the object rotates about the origin such that it lies on the rim of the circumference defined by the lever arm...
7.8K
01:25Single-pass Transmembrane Proteins
6.7K
Integral membrane proteins are tightly associated with the cell membrane and play a crucial role in cell communication, signaling, adhesion, and transport of the molecules. Some integral membrane proteins are present only in the membrane monolayer. For example, the enzyme fatty acid amide hydrolase is present in the cytoplasmic side of the membrane monolayer. In contrast, another type of integral membrane protein, also known as a transmembrane protein, spans across the membrane. Transmembrane...
6.7K
01:28Inductance: Single-Phase And Three-Phase Line
641
Understanding the inductance of transmission lines is crucial for efficient design and operation in electrical power systems. This discussion delves into the inductance characteristics of single-phase two-wire and three-phase three-wire transmission lines with equal phase spacing.
Single-Phase Two-Wire Line:
A single-phase line consists of two solid cylindrical conductors, denoted as x and y. Each conductor carries phasor currents ix and iy, respectively. Given that the sum of these currents is...
Single-Phase Two-Wire Line:
A single-phase line consists of two solid cylindrical conductors, denoted as x and y. Each conductor carries phasor currents ix and iy, respectively. Given that the sum of these currents is...
641
01:25Capacitance: Single-Phase And Three-Phase Line
616
In electrical power systems, understanding the capacitance of transmission lines is fundamental for efficient operation.
Single-Phase Lines
Consider a single-phase, two-wire transmission line with equal phase spacing energized by a voltage source. One conductor carries a uniform positive charge, while the other carries an equal negative charge. The capacitance C of the line can be derived from the voltage V between the conductors. For a one-meter section of the line, the capacitance is given...
Single-Phase Lines
Consider a single-phase, two-wire transmission line with equal phase spacing energized by a voltage source. One conductor carries a uniform positive charge, while the other carries an equal negative charge. The capacitance C of the line can be derived from the voltage V between the conductors. For a one-meter section of the line, the capacitance is given...
616