Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Novel 'crumpling' of hybrid nanostructures increases SERS sensitivity

05.11.2015

By "crumpling" to increase the surface area of graphene-gold nanostructures, researchers from the University of Illinois at Urbana-Champaign have improved the sensitivity of these materials, opening the door to novel opportunities in electronics and optical sensing applications.

"I believe that this work will benefit researchers in the area of surface plasmonics by providing a new strategy/design for enhancing the surface enhanced Raman spectroscopy (SERS) detection limit," explained SungWoo Nam, an assistant professor of mechanical science and engineering at Illinois.


Illustration of SERS enhancement from a crumpled graphene-Au nanoparticles hybrid structure. Raman spectrum is enhanced the most when the target molecule is situated at the center of Au nanoparticles in valley of crumpled graphene as depicted in inset.

Credit: University of Illinois

"This mechanical self-assembly strategy will enable a new class of 3D crumpled graphene?gold (Au) nanostructures. The enhanced limit of detection will allow biomedical and environment monitoring of important molecules at high sensitivity by SERS."

SERS substrates are used to analyze the composition of a mixture at the nanoscale for environmental analysis, pharmaceuticals, material sciences, art and archeological research, forensic science, drug detection, food quality analysis, and single cell detection. Using a combination of gold and silver nanoparticles and Raman-active dyes, SERS substrates also can target specific DNA and RNA sequences.

"This work demonstrates the unique capability of micro-to-nanoscale topographies of the crumpled graphene-Au nanoparticles--higher density, three-dimensional optically active materials--that are further enhanced by the formation of hot spots, bringing the nanoparticles closer," explained Juyoung Leem, a graduate student and first author of the study, "Mechanically Self-Assembled, Three-Dimensional Graphene?

Gold Hybrid Nanostructures for Advanced Nanoplasmonic Sensors," published in Nano Letters. "We achieve a 3D crumpled graphene?Au hybrid structure by the delamination and buckling of graphene on a thermally activated, shrinking polymer substrate. This process enables precise control and optimization of the size and spacing of integrated Au nanoparticles on crumpled graphene for higher SERS enhancement."

According to Nam, the 3D crumpled graphene?Au nanostructure exhibits at least one order of magnitude higher SERS detection sensitivity than that of conventional, flat graphene?Au nanoparticles. The hybrid structure is further adapted to arbitrary curvilinear structures for advanced, in situ, nonconventional, nanoplasmonic sensing applications.

"One of the key advantages of our platform is its ability to shrink and adapt to complex 3D surfaces, a function that has not been previously demonstrated," Nam stated. An earlier study by Nam's research group was the first to demonstrate graphene integration onto a variety of different microstructured geometries, including pyramids, pillars, domes, inverted pyramids, and the 3D integration of gold nanoparticle/graphene hybrid structures.

###

In addition to Leem and Nam, the study's co-authors include post-doctoral researcher Pilgyu Kang and graduate student Michael Cai Wang in the Department of Mechanical Sciences and Engineering. Experiments were carried out in part in the Frederick Seitz Materials Research Laboratory, the Micro and Nano Technology Laboratory, and the Beckman Institute Imaging Technology Group at Illinois.

SungWoo Nam | EurekAlert!

More articles from Materials Sciences:

nachricht A new tool for discovering nanoporous materials
23.05.2017 | Ecole Polytechnique Fédérale de Lausanne

nachricht Did you know that packaging is becoming intelligent through flash systems?
23.05.2017 | Heraeus Noblelight GmbH

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Turmoil in sluggish electrons’ existence

An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.

We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...

Im Focus: Wafer-thin Magnetic Materials Developed for Future Quantum Technologies

Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.

Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...

Im Focus: World's thinnest hologram paves path to new 3-D world

Nano-hologram paves way for integration of 3-D holography into everyday electronics

An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...

Im Focus: Using graphene to create quantum bits

In the race to produce a quantum computer, a number of projects are seeking a way to create quantum bits -- or qubits -- that are stable, meaning they are not much affected by changes in their environment. This normally needs highly nonlinear non-dissipative elements capable of functioning at very low temperatures.

In pursuit of this goal, researchers at EPFL's Laboratory of Photonics and Quantum Measurements LPQM (STI/SB), have investigated a nonlinear graphene-based...

Im Focus: Bacteria harness the lotus effect to protect themselves

Biofilms: Researchers find the causes of water-repelling properties

Dental plaque and the viscous brown slime in drainpipes are two familiar examples of bacterial biofilms. Removing such bacterial depositions from surfaces is...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

AWK Aachen Machine Tool Colloquium 2017: Internet of Production for Agile Enterprises

23.05.2017 | Event News

Dortmund MST Conference presents Individualized Healthcare Solutions with micro and nanotechnology

22.05.2017 | Event News

Innovation 4.0: Shaping a humane fourth industrial revolution

17.05.2017 | Event News

 
Latest News

Scientists propose synestia, a new type of planetary object

23.05.2017 | Physics and Astronomy

Zap! Graphene is bad news for bacteria

23.05.2017 | Life Sciences

Medical gamma-ray camera is now palm-sized

23.05.2017 | Medical Engineering

VideoLinks
B2B-VideoLinks
More VideoLinks >>>