Journal ArticleDOI
Defect-engineered graphene chemical sensors with ultrahigh sensitivity
Reads0
Chats0
TLDR
This study revealed that defect engineering in graphene has significant potential for fabricating ultra-sensitive graphene chemical sensors and systematically investigated the mechanism of gas sensing, which indicated that the vacancy defect is a major contributing factor to the enhanced sensitivity.Abstract:
We report defect-engineered graphene chemical sensors with ultrahigh sensitivity (e.g., 33% improvement in NO2 sensing and 614% improvement in NH3 sensing). A conventional reactive ion etching system was used to introduce the defects in a controlled manner. The sensitivity of graphene-based chemical sensors increased with increasing defect density until the vacancy-dominant region was reached. In addition, the mechanism of gas sensing was systematically investigated via experiments and density functional theory calculations, which indicated that the vacancy defect is a major contributing factor to the enhanced sensitivity. This study revealed that defect engineering in graphene has significant potential for fabricating ultra-sensitive graphene chemical sensors.read more
Citations
More filters
Journal ArticleDOI
Recent Advances in Sensing Applications of Graphene Assemblies and Their Composites
Tran Thanh Tung,J. Nine,Melinda Krebsz,Tibor Pasinszki,Campbell J. Coghlan,Diana N. H. Tran,Dusan Losic +6 more
TL;DR: In this paper, the authors present and discuss recent advances in synthesis strategies of assembled graphene-based superstructures of 1D, 2D, and 3D macroscopic shapes in the forms of fibers, thin films and foams/aerogels.
Journal ArticleDOI
Recent Developments in 2D Nanomaterials for Chemiresistive-Type Gas Sensors
Seon-Jin Choi,Il-Doo Kim +1 more
TL;DR: In this article, a review of recent achievements of 2D nanostructured materials for chemiresistive-type gas sensors is presented, where the basic sensing mechanism is described based on charge transfer behavior between gas species and 2D nano-materials.
Journal ArticleDOI
Graphene-based electrochemical biosensors for monitoring noncommunicable disease biomarkers
TL;DR: The detection performances of the graphene-based electrochemical biosensors are in the range of ng/mL and have reached up to fg/mL in detecting the targets of NCDs with higher selectivity, sensitivity and stability with good reproducibility attributes.
Journal ArticleDOI
Suspended black phosphorus nanosheet gas sensors
TL;DR: In this article, the performance of suspended Exfoliated Black Phosphorus (BP)-based chemical sensors was investigated by floating BP flakes on top of electrode posts to provide full (both sides) adsorption sites and avoid interface scattering effects.
Journal ArticleDOI
Investigation of Microstructure Effect on NO2 Sensors Based on SnO2 Nanoparticles/Reduced Graphene Oxide Hybrids
TL;DR: The results can prove the tailoring sensing behavior of the gas sensor according to different structures of materials.
References
More filters
Journal ArticleDOI
Probing the Nature of Defects in Graphene by Raman Spectroscopy
Axel Eckmann,Alexandre Felten,Alexandre Felten,Artem Mishchenko,L. Britnell,Ralph Krupke,Kostya S. Novoselov,Cinzia Casiraghi +7 more
TL;DR: A detailed analysis of the Raman spectra of graphene containing different type of defects is presented, finding that the intensity ratio of the D and D' peak is maximum for sp(3)-defects, it decreases for vacancy-like defects, and it reaches a minimum for boundaries in graphite.
Journal ArticleDOI
Reduced graphene oxide molecular sensors.
TL;DR: Reduced graphene oxide is demonstrated as the active material for high-performance molecular sensors fabricated from exfoliated graphene oxide platelets that are deposited to form an ultrathin continuous network.
Journal ArticleDOI
Adsorption of H 2 O , N H 3 , CO, N O 2 , and NO on graphene: A first-principles study
TL;DR: In this paper, the authors investigated the adsorption of CO, CO, and NO on a graphene substrate using first-principles calculations and determined the optimal position and orientation of these molecules on the graphene surface.
Journal ArticleDOI
Defect-induced magnetism in graphene
Oleg V. Yazyev,Lothar Helm +1 more
TL;DR: In this article, the magnetism in graphene induced by single carbon atom defects has been studied from first principles and the itinerant magnetism due to the defect-induced extended states has been observed.
Journal ArticleDOI
Improving gas sensing properties of graphene by introducing dopants and defects: a first-principles study.
TL;DR: This work reveals that the sensitivity of graphene-based chemical gas sensors could be drastically improved by introducing the appropriate dopant or defect.