63results about How to "High Seebeck coefficient" patented technology

A thermoelectric device that can exhibit substantially high specific power density is provided. The device includes core having a p-type element made from carbon nanotube and an n-type element. The device also includes a heat plate in and a cool plate, between which the core can be positioned. The design of the thermoelectric device allows the device to operate at substantially high temperature and to generate substantially high power output, despite being light weight. A method for making the thermoelectric device is also provided.

An IR detector in the form of a thermopile including one or more thermocouples on a dielectric membrane supported by a silicon substrate. Each thermocouple is composed of two materials, at least one of which is p-doped or n-doped single crystal silicon. The device is formed in an SOI process. The device is advantageous as the use of single crystal silicon reduces the noise in the output signal, allows higher reproducibility of the geometrical and physical properties of the layer and in addition, the use of an SOI process allows a temperature sensor, as well as circuitry to be fabricated on the same chip. The detector can also have an IR filter wafer bonded onto it and/or have arrays of thermopiles to increase the sensitivity. The devices can also be integrated with an IR source on the same silicon chip and packaged to form a complete and miniaturised NDIR sensor.

A thermoelectric material including: a thermoelectric matrix; and a plurality of metal nanoparticles disposed in the thermoelectric matrix, wherein a difference between a work function of thermoelectric matrix and a work function of a metal particle of the metal nanoparticles is about −1.0 electron volt to about 1.0 electron volt.

Composite epitaxial materials that comprise semimetallic ErAs nanoparticles or nanoislands epitaxially embedded in a semiconducting In_0.53Ga_0.47As matrix both as superlattices and randomly distributed throughout the matrix are disclosed. The presence of these particles increases the free electron concentration in the material while providing scattering centers for phonons. Electron concentration, mobility, and Seebeck coefficient of these materials are discussed and their potential for use in thermoelectric power generators is postulated. These composite materials in accordance with the present invention have high electrical conductivity, low thermal conductivity, and a high Seebeck coefficient. The ErAs nanoislands provides additional scattering mechanism for the mid to long wavelength phonon—the combination reduces the thermal conductivity below the alloy limit.

A method of manufacturing a thermoelectric conversion material expressed by a chemical formula X₃T₃Z₄ (X comprises one or more elements selected from Zr, Hf, Y, La, Nb, and Ta, while including at least Zr or Hf; T comprises one or more elements selected from Ni, Co, Cu, Rh, Pd, Ir, and Pt, while including at least Ni; Z comprises one or more elements selected from Sb, Ge, and Sn, while including at least Sb), the method comprising: preparing materials containing elements, which are the X including selected elements, the T including selected elements, and the Z including selected elements; forming an alloy A by melting the materials containing the all selected elements except for Sb; and forming an alloy B by melting the alloy A and the material containing Sb.

The invention relates to a hole compensation type skutterrudite thermoelectric material and a preparation method of the hole compensation type skutterudite thermoelectric material. The hole compensation type skutterudite thermoelectric material is shown in the following description: RyA(4-x)BxSb12/z NC, wherein x is equal to or greater than 0.01 and equal to or less than 0.5, y is equal to or greater than 0.01 and equal to or less than 1 and z is equal to or greater than 0% and equal to or less than 10%; R is selected from at least one of the following group of elements: Ca, Ba, La, Ce, Pr, Nd and Yb; A is selected from at least one of the following group of elements: Fe, Co and Ni; B is selected from at least one of the following group of transition metal elements: Ti, V, Cr, Mn, Fe, Nb, Mo, Tc and Ru, and electron number of the element B is less than that of the element A; and NC is in phase II, wherein z is mole% in the phase II of the thermoelectric material. The invention also provides the preparation method of the hole compensation type skutterrudite thermoelectric material.

The invention discloses a method for preparing silver antimony tellurium and silver telluride based on-site composite thermoelectric material, including the steps: weighing silver, antimony and tellurium according to the formula: Agx Sb2-xTe3-x, wherein x being 086 to 0.95, enveloping the same in a vacuum quartz tube, heating to 1000 to 1100 DEG C for fully fusing, keeping for 600 to 1000 minutes, cooling at the speed of 1 DEG C per minute to 900 DEG C, placing the quartz tube into the liquid nitrogen for quenching, obtaining the castingsolid material, ball milling and crushing, obtaining the block thermoelectric alloy. The invention has simple process, lower cost, short period and adaptability for mass productuion, the prepared block silver antimony tellurium and silver telluride based on-site composite thermoelectric material has lower thermal conductivity and higher Seebeck coefficient, thus obtaining higher room-temperature thermoelectricalmerit.

The invention discloses a method for preparing a high thermoelectrical antimony telluride micro-nano crystal and a block material thereof. The method comprises the following steps: dissolving an antimony precursor into polyol, then mixing the obtained solution with a tellurium precursor and a complexing agent, heating the mixed solution at a temperature of 140 to 180 under stirring, cooling to a temperature of 100 to 120 DEG C, adding a reducing agent, carrying out reactions at a temperature of 120 to 180 DEG C for 6 to 48 hours so as to obtain precipitate, washing the obtained precipitate by waterless ethanol until the washing liquid is neutral, drying the washed precipitate in vacuum so as to obtain antimony telluride micro-nano crystal, cold-pressing the obtained antimony telluride crystal into a sheet, and then carrying out annealing for 2 to 24 hours at a temperature of 300 to 400 DEG C in an atmosphere of mixed gas composed of Ar and H2 with a volume ratio of 92%:8% so as to obtain an antimony telluride block material. The obtained antimony telluride micro-nano crystal and block material thereof have the characteristics of high purity and good thermoelectrical property. Moreover the preparation method has the advantages of simpleness, low cost, easiness in repeating, and suitability for massive production, and thus has a good commercialization prospect.

The present invention relates to a preparation method for SnTe thermoelectric materials with high output power density and energy conversion efficiency, and relates to the preparation method for SnTethermoelectric material. The problem is solved that the output power density and energy conversion efficiency of the current thermoelectric materials cannot be improved at the same time. The preparation method comprises the steps that: 1, according to the stoichiometric ratio of (SnTe)2.94(In2Te3)0.02-(Cu2Te)3x, the Sn powder, the Te powder, the In powder and the Cu powder are weighed; the mixtureis put in a high-temperature muffle furnace to perform heat preservation at a high temperature, then cooling and heat preservation and finally furnace cooling to obtain ingot casting; and 3, the ingot casting is grinded and put in a graphite mold to perform sintering at a certain temperature and pressure to obtain In-Cu co-doped SnTe thermoelectric materials. The preparation method for SnTe thermoelectric materials with high output power density and energy conversion efficiency is suitable for preparation of the SnTe thermoelectric materials with high output power density and energy conversion efficiency.

Disclosed is a method of manufacturing a thermoelectric material having high thermoelectric conversion performance at a wide temperature range. The method of manufacturing a thermoelectric material according to the present invention comprises the following steps: forming a mixture by mixing copper and selenium according to the following chemical formula 1: Cu_xSe; and forming the mixture by heat treating the mixture. In chemical formula 1, 2<x<=2.6. The thermoelectric material can include an induced nano DOT (INDOT) as a copper containing particle. Here, INDOT represents a particle with a diameter, for example, between 1 nanometer and 100 nanometers which is spontaneously generated during a thermal material formation process. This nano DOT, that is INDOT, can exist on a grain boundary of a semiconductor.

An n-type thermoelectric conversion material that has a high Seebeck coefficient, a low electric resistivity, and a large power factor includes, as its main constituent, a metal material mainly containing Ni, and includes an oxide material containing Sr, Ti, and a rare-earth element in the range of about 10 wt % to about 30 wt %. The oxide material is a SrTiO₃ based oxide material. For producing the thermoelectric conversion material, through the steps of mixing and grinding a SrTiO₃ based oxide material and a Ni metal powder to prepare a mixture, forming this mixture into a shape to prepare a compact, and then firing the compact, the thermoelectric conversion material is obtained.

The invention provides a thermoelectric material and a preparation method thereof, and belongs to the technical field of thermoelectric materials. The thermoelectric material comprises the following raw material components according to the molar weight ratio: 0.8 to 0.925 mmol of bismuth nitrate pentahydrate, 1.35 to 1.65 mmol of selenium powder, 0.075 to 0.2 mmol of cerium nitrate hexahydrate, 0.53 to 0.65 mmol of ethanolamine and 0.82 to 1 mmol of 2-methoxyethanol; according to the thermoelectric material, Ce < 3 + > of cerium nitrate hexahydrate equivalently replaces a doping mode of Bi < 3+ > in bismuth selenide obtained by selenium powder and bismuth nitrate pentahydrate; interdependence of the seebeck coefficient and the conductivity of the cerium-doped bismuth selenide thermoelectric material is eliminated, and the obtained thermoelectric material has the characteristics of high conductivity, high seebeck coefficient, high quality factor and the like.

The invention relates to a preparation method of a poly(p-phenylene) nanoparticle composite ZnO-based thermoelectric material system. The preparation method comprises the following steps of: adding poly(p-phenylene) nanoparticles into sulfuric acid of which the concentration is higher than 85%, stirring for 5-10 minutes at 20-50 DEG C, filtering, washing, drying, and carrying out ball milling on a high-energy ball mill for 0.5-4 hours; dissolving 0.1-10mol% of acetate of dopant ion and 2.20g of zinc acetate into 500ml of diglycol, adding 20ml of water, stirring for 10 minutes at 160-170 DEG C, and standing for 2 hours after a white precipitate appears, thereby obtaining ZnO sol; adding the treated poly(p-phenylene) nanoparticles into the ZnO sol, stirring, dispersing for 30 minutes under the ultrasonic condition, heating to 160-170 DEG C, and reacting for 1 hour; and washing the product with anhydrous alcohol and deionized water many times, drying at 100 DEG C, and carrying out discharge plasma sintering to obtain the blocky poly(p-phenylene) nanoparticle composite ZnO-based thermoelectric material. The preparation method provided by the invention has the characteristics of simple and practicable method, low reaction temperature, short reaction time, low energy consumption, good chemical uniformity and the like.

The invention provides S-doped modified BiCuSeO-based thermoelectric material and a preparation method thereof. The thermoelectric material is BiCuSeO1-xSx, x=0.01-0.05. The preparation method comprises two-step solid phase reaction and discharge plasma sintering molding (SPS). The preparation method is simple in technology and easy to operate. Compared with pure phase BiCuSeO, the thermoelectric merit figure ZT of the thermoelectric material BiCuSeO1-xSx is enhanced for more than 50%.

The present invention provides a thermoelectric conversion material having a considerably increased Seebeck coefficient, and a thermoelectric conversion device, a thermo-electrochemical cell and a thermoelectric sensor which include the material. The thermoelectric conversion material of the present invention includes a redox pair and a capture compound which captures only one of the redox pair selectively at low temperature and releases at high temperature.

The invention relates to the field of composite and thermoelectric material, and provides a preparation method of an artificial multi-layer structure strontium titanate thermoelectric material. The proportion of matrix and embedded phase in the designed structure and the number of stacked surfaces are adjusted to ensure that the material has both high electrical conductivity and low thermal conductivity. The preparation method comprises the following steps: firstly, cubic phase niobium-doped strontium titanate is prepared as a matrix conductive phase by a solid state method under the anoxic condition; then R-P-structure lamellar strontium titanate is prepared as the embedded phase by using a molten salt method; and then a green body is prepared by the cubic phase niobium-doped strontium titanate and the R-P-structure lamellar strontium titanate according to different mas ratios through the curtain coating and other processes and then sintered by the sps method so that the artificial multilayer structure strontium titanate thermoelectric material is obtained. The material has a first-order phonon scattering mechanism formed by the interface between the embedded phase and the matrix,a second-order phonon scattering mechanism formed by directional arrangement of the embedded phase in the matrix and a third-order phonon scattering mechanism formed by a plurality of sub-layer interfaces. The material is enabled to have both high electrical conductivity and low thermal conductivity so as to provide a new idea for improving the thermoelectric performance of the material.

The invention provides a compound capable of being used for a thermoelectric material and a preparation method of the compound, the general formula of the compound is Ln2ABQ5, and Ln in the formula is any one or a combination of more than two of trivalent rare earth ions; A is any one or two of Cu or Ag; B is any one or two of Sb or Bi; Q is any one or a combination of more than two of S, Se or Te. The compound capable of being used for the thermoelectric material has a unique chain crystal structure, has the advantages of high seebeck coefficient, high electrical conductivity, low thermal conductivity and the like, and is a thermoelectric material with excellent performance, and the corresponding preparation method is simple in process step and cheap and easily available in raw materials so that the compound is convenient to popularize and apply.

The invention discloses a pyroelectric uncooled infrared detector with a three-dimensional double-layer structure, which belongs to the field of infrared detection. The invention includes a silicon substrate, a plurality of thermocouples with a three-dimensional double-layer structure, a self-selecting frequency infrared absorber with a three-layer structure, a contact high electrode, a contact low electrode and a silicon dioxide film, and is compatible with CMOS technology. The invention adopts a thermocouple with a three-dimensional double-layer structure, which has higher space utilization rate, better responsivity, detection sensitivity and noise equivalent power than the traditional planar thermocouple, and greatly improves the performance of the device; A self-selecting frequency infrared absorber with a three-layer structure does not require additional filters, and it absorbs almost 100% of specific wavelength bands.