The present disclosure relates to graphene. In particular, the present disclosure relates to a method for continuously preparing thermally conductive graphene films. A graphite oxide containing 40-60 wt % of moisture is directly stripped at a high temperature; and then, procedures such as dispersion, defoaming, coating, stripping, trimming, and reduction are performed to prepare thermally conductive graphene films with high thermal conductivity coefficient and strong electromagnetic shielding effectiveness. In the method, because of directly stripping the graphite oxide containing 40-60 wt % of moisture at a high temperature, the procedure of drying the graphite oxide is omitted, achieving low energy consumption and low manufacturing costs. Compared with preparing slurry by directly dispersing the graphite oxide, the concentration of the slurry after high temperature stripping is higher, and can reach 3-20 wt %.

Methods for producing graphene-based products using graphene paste compositions. These methods include producing free-standing graphene foils, films, sheets, polymer supported graphene films, printed graphene structures, graphene features on polymer films, graphene substrates, and graphene metal foils. The methods impart functional characteristics, including corrosion protection and barrier properties to achieve selective enhancement of desired electrical, thermal, mechanical, barrier and other properties.

The present invention is a surface-modified carbon material including chemical addends added to the surface of graphene, such that a one-dimensional periodicity corresponding to a large number of addition positions of the chemical addends can be observed in a Fourier-transformed image of a scanning probe microscopic image of the surface of graphene. The surface-modified carbon material of the present invention has a bandgap and therefore can be used as a sensor capable of electronically controlling an operation or another electronic device.

The present invention relates to a method for connecting an electrical contact to a nanomaterial carried by a substrate. At least one layer of soluble lithography resist is provided on the nanomaterial. An opening in the at least one layer of resist exposes a surface portion of the nanomaterial. At least a portion of the exposed surface portion of the nanomaterial is removed to thereby expose the underlying substrate and an edge of the nanomaterial. A metal is deposited on at least the edge of the nanomaterial and the exposed substrate such that the metal forms an electrical contact with the nanomaterial. Removing at least a portion of the soluble lithography resist from the nanomaterial such that at least a portion of the two-dimensional material is exposed.

Provided are a method for producing a fuel cell separator, and a separator material that can prevent carbon in a carbon layer formed on the surface of a metal substrate from being detached during press forming, and thus can suppress failures in the press forming. The method is a method for producing a fuel cell separator having formed thereon gas flow channels through which fuel gas or oxidant gas to be supplied to a fuel cell stack flows, the method including preparing a plate-shaped separator material including a titanium substrate, a carbon layer covering the titanium substrate, and a resin layer covering the carbon layer; press-forming the prepared separator material into the shape of the separator such that the separator has the gas flow channels formed thereon; and removing the resin layer from the press-formed separator.

Embodiments herein relate to chemical sensors, devices and systems including the same, and related methods. In an embodiment, a medical device is included having a graphene varactor including a graphene layer and a self-assembled monolayer disposed on an outer surface of the graphene layer through non-covalent interactions between the self-assembled monolayer and a -electron system of graphene. The self-assembled monolayer includes one or more pillarenes, substituted pillarenes, calixarenes, substituted calixarenes, peralkylated cyclodextrins, substituted peralkylated cyclodextrins, pyrenes, or substituted pyrenes, or derivatives thereof. Other embodiments are also included herein.

A method for detecting an analyte comprises providing a first carbon-based material comprising reactive chemistry additives, providing conductive electrodes connected to the first carbon-based material, exposing the first carbon-based material to an analyte, applying a plurality of alternating currents having a range of frequencies across the conductive electrodes, and measuring the complex impedance of the first carbon-based material using the plurality of alternating currents.

A graphene-enabled hybrid particulate for use as a cathode active material of an alkali metal-selenium battery, wherein the hybrid particulate is composed of a single or a plurality of graphene sheets and one or a plurality of fine selenium particles or coatings, having a diameter or thickness from 0.5 nm to 10 m, and the graphene sheets and the selenium particles or coatings are mutually bonded or agglomerated into a hybrid particulate containing an exterior graphene sheet or multiple exterior graphene sheets embracing the selenium particles or coatings, and wherein the hybrid particulate has an electrical conductivity no less than 10.sup.4 S/cm and the graphene amount is from 0.01% to 30% by weight based on the total weight of graphene and selenium combined. Typically and desirably, the hybrid particulate is substantially spherical or ellipsoidal in shape.

In this patent, a high energy and power density supercapacitor was invented. A coin cell with supercapacitor includes a spring lamination, a working electrode, a counter electrode, a separator, and an Organic electrolyte. The working and counter electrodes were Activated carbon/N-doping porous graphene/binder coated on Aluminum substrate. The separator was from Nippon Kodoshi Corporation. The Organic electrolyte was 1M TEABF4/PC. The method of producing N-doping porous graphene included the following steps: Step 1: Graphite oxide (GO) was transferred into the furnace. Step 2: Inject 50 c.c./min gas flow of Nitrous oxides for one hour. Step 3: Intensify 40 Celsius degrees/min to 900 Celsius degrees and after holding for one hour, lower the temperature naturally to the room temperature, it can be prepared into N-doping porous graphene. In this patent, the capacitance of the supercapacitor is 122 F/g and the power density is 31 kW/Kg.

An electrode includes an electrode composition having graphenes; carbon black particles having a Brunauer-Emmett-Teller (BET) surface area greater than 90 m.sup.2/g, and an oil adsorption number (OAN) greater than 150 mL/100 g, wherein the ratio of the carbon black particles to the graphenes ranges from 3:1 to 6:1 by weight; and an electroactive material selected from the group consisting of lithium nickel cobalt manganese oxide and lithium nickel cobalt aluminum oxide, wherein the total concentration of the graphenes and the carbon black particles is equal to or less than 2 wt % of the electrode composition; and a current collector contacting the electrode composition.