Reduced graphene oxide: an introduction
Graphene, a 2D sheet of carbon atoms arranged in a chicken wire pattern, is a fascinating material that boasts many exciting properties like mechanical strength, thermal and electrical conductivity, intriguing optical properties and more. Graphene is the focus of vigorous R&D, but its relatively high price is a hindrance at the moment.
Graphene oxide is a form of graphene that includes oxygen functional groups, and has interesting properties that can be different than those of graphene. By reducing graphene oxide, these oxidized functional groups are removed, to obtain a graphene material. This graphene material is called reduced graphene oxide, often abbreviated to rGO. rGO can also be obtained from graphite oxide, a material made of many layers of graphene oxide, after a series of reduction to graphene oxide and then to rGO.
How is rGO produced?
Since effective yet inexpensive ways to make graphene (or closely related materials, such as rGO) are being intensively sought for, the reduction of graphene oxide (or graphite oxide) to rGO is popular and attractive. Several methods of reduction into rGO exist, and are rather cost-efficient and simple.
While rGO is indeed a form of graphene with properties similar to that of graphene (good conductive properties etc.), rGO usually contains more defects and is of lesser quality than graphene produced directly from graphite. Reduced graphene oxide (rGO) contains residual oxygen and other heteroatoms, as well as structural defects. Despite rGO’s less-than-perfect resemblance to pristine graphene, it is still an appealing material that can definitely be sufficient in quality for various applications, but for more attractive pricing and manufacturing processes. Reduced graphene oxide can be used (depending on the specific material’s quality) for the same various applications suitable for graphene use, like composite materials, conductive inks, sensors and more.
Reduced GO is often a natural and understandable choice for applications that call for large amounts of material due to the relative ease in creating sufficient quantities of graphene in a relatively low cost.
The process of reducing graphene oxide to produce reduced graphene oxide is extremely important as it has a large impact on the quality of the rGO produced, and therefore will determine how close rGO will come, in terms of structure and properties, to pristine graphene.
A number of processes exist for the reduction of GO, based on chemical, thermal or electrochemical approaches. Some of these techniques are able to produce very high quality rGO, similar to high-quality graphene, but can be complex, expensive or time consuming to carry out.
Once reduced graphene oxide has been produced, there are ways to functionalize the material for specific use in different applications. By treating rGO with various chemicals or by creating new compounds by combining rGO with other two-dimensional materials, it’s possible to enhance the properties of the compound to suit commercial applications.
In some applications, the reduction of the GO to rGO is performed as part of the device manufacturing process. For example, a process could start with GO, mix it with a material to create a composite, and reduce the GO into rGO as part of the composite creation process or afterwards.
rGO Applications
In general, it can be said that rGO is suitable for the same sorts of applications as graphene, as the properties of these materials are similar, albeit normally less impressive at the rGO end. As was said before, the properties of rGO can vary depending on the method of preparation and the resulting morphology and chemistry of the specific rGO.
Reduced GO can be used for many applications, among these are: energy storage, composite materials, field effect transistors and more.
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Doping strategy, not surface area, proves key to better graphene capacitor electrodes
Researchers at Parahyangan Catholic University, Universitas Pertamina, the Korea Institute of Science and Technology (KIST), and Politeknik Negeri Bandung have found that how graphene oxide is doped matters more than how much surface area the resulting material has, when it comes to building better cathodes for lithium-ion capacitors.
The team synthesized a series of doped reduced graphene oxide (rGO) materials using a modified Hummers' method followed by hydrothermal doping, introducing boron, fluorine, nitrogen and sulfur in both dual-element and quaternary (four-element) combinations. Each variant was characterized structurally (XRD, Raman spectroscopy, BET surface area analysis, XPS, SEM) and tested electrochemically in half-cell configurations using galvanostatic charge-discharge, cyclic voltammetry and impedance spectroscopy.
The Graphene Catalog gets a major upgrade: search, a responsive redesign and faster browsing
We are happy to announce that we have overhauled the Graphene Catalog, Graphene-Info's free directory of commercial graphene materials — covering graphene oxide, graphene flakes, graphene sheets, graphene inks and 3D-printing filaments from producers worldwide.
The headline addition is search: from any page you can now look up a product by name, or search by material type, form or producer (for example "conductive ink", "CVD sheets" or "GO powder"). The site has also been rebuilt to be fully mobile-friendly and responsive — listings reflow into cards on phones and use the full screen width on desktop — and it's noticeably faster and now ad-free.
Researchers use reduced graphene oxide electrodes to build a compact electrically tunable soft lens
Researchers at Queen Mary University of London, led by Prof. James Busfield, have developed transparent electrodes made of reduced graphene oxide (rGO) for dielectric elastomer actuators (DEAs), enabling a new compact, electrically tunable soft lens. The work addresses a long-standing design constraint in electrostatically actuated lenses, where opaque compliant electrodes have to be placed around the lens periphery rather than on the optical path itself.
A photo of the fabricated DEA actuator (the rGO-coated membrane with circular electrodes). Image from: Advanced Functional Materials
DEAs are soft electromechanical transducers that behave like artificial muscles: a dielectric elastomer membrane sandwiched between compliant electrodes contracts in thickness and expands laterally when an electric field is applied. They're being explored for tunable lenses, adaptive filters, camouflage skins and other electrically reconfigurable optical devices. Most implementations, however, rely on non-transparent electrodes, forcing a separate actuation ring around the lens body and increasing the device's footprint. Transparent compliant electrodes remove that constraint by letting the electrode sit directly on the optical axis.
Graphene-hydrogel electrodes stretch to 8,000% and keep their grip through sweat, hair and motion for continuous biosignal monitoring
Researchers from Drexel University and Penn State University have developed a printable hydrogel electrode, reinforced with laser-induced graphene (LIG) and reduced graphene oxide (rGO), that combines an ultralow Young's modulus of 1.08 kPa with roughly 8,000% stretchability (able to stretch to about 80 times its original size) and strong wet adhesion - properties aimed at solving one of wearable biosensing's persistent problems: keeping an electrode in stable contact with skin through sweat, body hair and everyday movement.
The deposited gel on the skin. Image from: Scienc Advances
Continuous, simultaneous monitoring of signals from the heart, brain, muscles and eyes is valuable for both physical and mental health tracking, since these physiological signals are interrelated - anxiety, for instance, shows up as coordinated changes across the heart, sweat glands, muscles and lungs. But conventional metal- or gel-based bioelectrodes tend to lose performance on hairy skin, under sweating conditions, or simply from the mechanical mismatch between a stiff electrode and soft, stretchy skin during long-term wear.
Flexible bidirectional graphene neural interface combines transistors and rGO electrodes
A team of researchers, led by IMB-CNM-CSIC and ICN2, has developed a graphene-based bidirectional neural interface that can simultaneously record and modulate brain activity, overcoming a longstanding limitation in neurotechnology. The device combines graphene solution-gated field-effect transistors (gSGFETs) with nanoporous reduced graphene oxide (rGO) microelectrodes in a single, flexible platform, enabling both high-sensitivity monitoring and effective stimulation.
Neural interfaces are already used clinically to treat neurological disorders, but most current systems remain unidirectional. They typically deliver stimulation using fixed parameters, without the ability to adapt in real time to ongoing brain activity. Even in systems that can both stimulate and record, performance is often constrained - particularly when it comes to detecting very low-frequency signals, which are increasingly recognized as important biomarkers. The newly reported device addresses these challenges by integrating two complementary graphene technologies.
APTS‑functionalized reduced graphene oxide boosts perovskite solar cell efficiency
Researchers from Taiwan's National Cheng Kung University and Chung Yuan Christian University have developed an interface-engineering strategy to overcome key efficiency bottlenecks in mesoporous perovskite solar cells by introducing APTS-functionalized reduced graphene oxide (APTS-rGO) into the electron transport structure.
In this work, reduced graphene oxide (rGO) was chemically modified using 3-aminopropyltriethoxysilane (APTS), a silane coupling agent with both amine and silane functional groups. This dual functionality enables strong bonding with oxide surfaces such as TiO2 while simultaneously improving compatibility with the perovskite layer.
Researchers develop ultra-sensitive graphene aerogel pressure sensor for flexible e-skin and wearables
Researchers from Hebei University of Technology, Zhejiang Sci-Tech University, Nanjing University of Information Science and Technology and The Pennsylvania State University recently reported on a high-performance flexible pressure sensor based on an anisotropic reduced graphene oxide aerogel (rGOA), addressing the long-standing challenge of simultaneously achieving ultra-high sensitivity and a wide detection range in wearable and robotic sensing systems.
The device architecture integrates the rGOA sensing layer between a polyimide (PI) film with interdigital electrodes and a thin polydimethylsiloxane (PDMS) encapsulation layer. The aerogel itself is fabricated via a freeze-casting process that induces a highly ordered anisotropic structure. By controlling the freezing direction of the graphene oxide precursor, the researchers form a lamellar, porous 3D network that enables controlled deformation under pressure and efficient modulation of electrical pathways.
Graphene-based interlayer boosts Li-S battery performance
Researchers at India's Cochin University of Science and Technology have developed a bifunctional polyaniline/reduced graphene oxide (PRGO) interlayer integrated into a lithium-sulfur (Li-S) battery separator, demonstrating a practical route to mitigating polysulfide shuttling while improving electrochemical performance.
Li-S systems offer a theoretical specific capacity of 1675 mAh g−1 and energy density approaching 2600 Wh kg−1, but their commercialization has been hindered by sulfur’s extremely low conductivity (~5×10−30 S cm−1) and the dissolution and migration of lithium polysulfides (LiPSs). These soluble intermediates form during discharge - initially at 2.1–2.4V (long-chain polysulfides, ~25% of capacity, 418 mAh g−1) and then at 1.6–2.1V (short-chain species, ~75%, 1257 mAh g−1) - and readily diffuse toward the lithium anode, causing active material loss and rapid capacity fading.
Graphene-carbon black-SrO sensor enables sensitive theobromine detection at neutral pH
Researchers at Oregon State University (OSU), National Taipei University of Technology and Ming Chi University of Technology have developed a nanoscale electrochemical sensor that can measure theobromine in beverages with high sensitivity and accuracy. The central concept is engineered interfacial chemistry: the material creates localized alkaline microdomains directly at the electrode surface, enabling efficient electrochemical oxidation of theobromine while the bulk solution remains at neutral pH.
The sensing layer is a ternary nanocomposite combining strontium oxide (SrO), functionalized carbon black (f‑CB) and reduced graphene oxide (r‑GO). SrO forms nanoscale alkaline domains that facilitate interfacial proton abstraction from theobromine, effectively activating this weakly electroactive molecule at neutral pH. Reduced graphene oxide provides a highly conductive, high-surface-area network and engages in π–π interactions with the heterocyclic xanthine core of theobromine, enhancing adsorption at the electrode. Functionalized carbon black strengthens cross‑nanointerface electron transfer and remains a dominant pathway for charge transport, improving overall electrochemical performance.
Researchers develop graphene-engineered MXene for PFAS capture
Researchers from Hangzhou Normal University, Zhejiang Province Environmental Engineering Co., Hangzhou Hengjun Environmental Engineering Co., Zhejiang Carbon Reduction Technology Co., Princess Nourah bint Abdulrahman University, Kimyo International University in Tashkent, Urgench State University and Islamic University of Madinah have developed a graphene-enhanced electroadsorbent that tackles persistent PFAS pollutants in water.
PFAS are fluorinated pollutants that resist breakdown, accumulate in supplies, and challenge conventional treatments like carbon filters or membranes, which generate waste.
