{"product_id":"hopg","title":"HOPG","description":"\u003ch2 class=\"Polaris-Header-Title\" tabindex=\"-1\"\u003e\u003ca href=\"https:\/\/www.spmtips.com\/\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0909\/0452\/7174\/files\/MikroMasch-Logo.svg?v=1768988367\" alt=\"\"\u003e\u003c\/a\u003e\u003c\/h2\u003e\n\u003ch1\u003e\u003cspan style=\"color: rgb(0, 170, 255);\"\u003eHighly ordered pyrolytic graphite\u003c\/span\u003e\u003c\/h1\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0909\/0452\/7174\/files\/Highly-Oriented-Pyrolitic-Graphit-20121016071022.jpg?v=1771144264\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cem\u003eAtomic lattice of graphite (HOPG). Image size 1.7×1.7×0.2nm (ATC, Scan-8). Courtesy of Advanced Technologies Center (www.nanoscopy.net).\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ciframe width=\"1920\" height=\"1080\" src=\"https:\/\/www.youtube.com\/embed\/j39giG2gm7o\" title=\"MikroMasch Test Structures PA01 and HOPG\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003cdiv class=\"row pb-3\"\u003e\n\u003cdiv class=\"col-8\"\u003e\n\u003cdiv class=\"col-6\"\u003e\n\u003cp\u003e\u003cspan\u003eHOPG - Highly Ordered Pyrolytic Graphite is the material produced by the application of uniaxial pressure on deposited pyrocarbon at very high temperatures (sometimes more than 3000\u003c\/span\u003e\u003csup\u003eo\u003c\/sup\u003e\u003cspan\u003eC). Depending on deformation, temperature and annealing time one can get material with different mosaic spreads, amounts of defects and granular structures (average size of the grains and crystallites). The most suitable HOPG for STM\/AFM applications should have large grains and crystallites, a uniform surface with minimal steps (parts of broken carbon planes) and should allow easily cleaving of very thin layers, such that the surface of the sample can be refreshed many times for investigations.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan style=\"color: rgb(255, 0, 255);\"\u003eHOPG structure\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0909\/0452\/7174\/files\/HOPG-structure-20121016071004.gif?v=1771144496\"\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cem\u003ePositional relationship between two identical graphene planes A and B. Graphite structure can be described as an alternite succession of these planes ...ABABAB...\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e Graphite belongs to lamellar materials and consists of identical staked planes. Carbon atoms within a single plane interact much stronger than with those from adjacent planes. That explains the lamellar behavior of graphite. Each atom within a single plane has three nearest neighbours. The network of carbon atoms connected by shortest bonds looks like honeycomb. This two-dimensional and single-atom thick plane is called \"graphene\".\u003c\/p\u003e\n\u003cp\u003e\"Typical\" graphite, especially natural one, exhibits quite imperfect structure due to plenty of defects and inclusions. A number of technologies are developed for preparation of perfect graphite samples to take advantage of its unique structure. Of these, pyrolysis of organic compounds is the most common and effective.\u003cbr\u003e\u003cbr\u003eTo characterize perfection of HOPG samples, one uses the term \"mosaic spread\" which originates from X-ray crystallography. Similar to mica, HOPG specimens are layered polycrystals resembling a mosaic of microscopic monocrystal grains that are slightly disoriented with respect to each other. The disorientation of the graphene sheets is responsible for the broadening of the (002) diffraction peak.\u003c\/p\u003e\n\u003ch2\u003e\u003cspan style=\"color: rgb(255, 0, 255);\"\u003eHow is HOPG made?\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eAccording to the nature of graphite, higher annealing temperatures and longer annealing times reduce the number of defects in the material and allow it to approach “ideal” graphite. In principle, mosaicity, defects and granular structure may vary independently when annealing parameters change. But in the frame of the standard technology of HOPG production, a correlation between mosaic spread, defects and granular structure exists. Therefore, samples annealed at higher temperatures have lower mosaicity and a more ”ideal“ structure.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eAnnealing at 3000ºC under high pressure is a very complicated technological process, which imposes some restrictions on the annealed volume and causes a significant temperature gradient especially in the vicinity of the pressing pistons. As a result, the quality of the material is best at the center of the annealed volume where the highest temperature is achieved, while the amount of defects as well as mosaicity increase towards the outer part of the annealed plate, so that the external part that directly contacts the piston (the last 0.5-0.7mm) could hardly be called HOPG at all.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eDue to historical and price reasons, samples cut near these external regions (near the pistons) were used until recently for STM\/SPM applications, while the inner part of the annealed volume (plate) was used mainly for neutron and X-ray monochromators.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan style=\"color: rgb(255, 0, 255);\"\u003eCharacterization of MikroMasch HOPG\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe mosaic spread is characterized by measuring (in degrees) a full width at half maximum (FWHM) of the rocking curve (Cu-Kα radiation peak).\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eMosaic spread is measured by the standard method. Measurements are carried out with Cu-Kα radiation and the beam illuminating a significant part of the crystal simultaneously (approximately 8 X 8 mm taking into account the incident angle). This is important because the measured value of the mosaic spread depends not only on crystal quality, but also on the energy and the cross section of the reflected beam. This effect is caused mainly by large-scale surface inplanarity or large-scale inplanarity of the carbon layers. Small regions tested by a narrow beam could have additional mutual mismatch that increases the measured value of mosaic spread when the crystal is illuminated by a wide beam covering both regions simultaneously. In a similar way the large-scale mismatch between outer layers and deeper layers that start to involve reflection could increase the value of mosaicity measured with harder X-rays or with neutrons which have a larger penetration depth than Cu-Kα radiation.\u003c\/span\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003eHOPG\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eGrade\u003c\/strong\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003eMosaic\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eSpread\u003c\/strong\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003eSpread\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eAccuracy\u003c\/strong\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSide\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eThickness\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003eChip\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eApplication\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eZYA\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.4°\u003c\/td\u003e\n\u003ctd\u003e±0.1°\u003c\/td\u003e\n\u003ctd\u003eDouble\u003c\/td\u003e\n\u003ctd\u003e1 \u0026amp; 2mm\u003c\/td\u003e\n\u003ctd\u003e10×10mm\u003c\/td\u003e\n\u003ctd\u003eX-ray optics, SPM calibration, SPM substrates\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eZYB\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.8°\u003c\/td\u003e\n\u003ctd\u003e±0.2°\u003c\/td\u003e\n\u003ctd\u003eDouble\u003c\/td\u003e\n\u003ctd\u003e1 \u0026amp; 2mm\u003c\/td\u003e\n\u003ctd\u003e10×10mm\u003c\/td\u003e\n\u003ctd\u003eSPM substrates \u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eZYH\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3.5°\u003c\/td\u003e\n\u003ctd\u003e±1.5°\u003c\/td\u003e\n\u003ctd\u003eDouble\u003c\/td\u003e\n\u003ctd\u003e1 \u0026amp; 2mm\u003c\/td\u003e\n\u003ctd\u003e10×10mm\u003c\/td\u003e\n\u003ctd\u003eSPM substrate in non-critical work, training \u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003e\u003cspan style=\"color: rgb(255, 0, 255);\"\u003eDouble-sided samples\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0909\/0452\/7174\/files\/image-of-graphite-atomic-structure-20121016071043.jpg?v=1771144751\"\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cem\u003eOne of the first images of graphite atomic structure, obtained on FemtoScan microscopes Courtesy Advanced Technologies Center (www.nanoscopy.net) *Not for calibration of X-ray equipment.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSamples cut from the center of the annealed volume of HOPG that have the same mosaic spread throughout are called double-sided. To confirm the grade, the mosaic spread is measured on both sides of the sample. In such samples there is no degradation of quality through the sample, thus the quality of the freshly cleaved surface remains identical during the thinning of the sample. The thickness of the cleaved layers does not increase with the number of cleavings, so one can refresh the surface more times than with single-sided samples.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan style=\"color: rgb(255, 0, 255);\"\u003eSTM\/AFM applications\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0909\/0452\/7174\/files\/Typical-STM-image-of-HOPG-surface-20121016071045.jpg?v=1771144867\"\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cem\u003eTypical STM image of HOPG surface. Corresponding fragment of graphene structure is superimposed.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eHOPG terminated with graphene layer can serve as an ideal atomically flat surface to be used as a substrate or standard for STM\/AFM investigations. This is also an easily \"cleavable\" material with a smooth surface, which is vital for SPM measurements that require a uniform, flat, and clean substrates.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan style=\"color: rgb(255, 0, 255);\"\u003eX-ray\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eDue to the good quality confirmed by precise X-ray control, our HOPG can be used not only as an STM substrate, but also as crystal-monochromators for X-rays and neutrons (nevetheless, it is important to inform us in advance that certain samples are going to be used as monochromators – we will choose crystals with better planarity from a batch).\u003c\/span\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003chr\u003e\n\u003ch2 class=\"title title--sxl\"\u003e\u003cspan style=\"color: rgb(255, 128, 0);\"\u003eHOPG-ZYA\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch3 class=\"title title--xsm-secondary sbo-xxxs-constant\"\u003eHOPG with mosaic spread value 0.4°±0.1°, double sided, 10×10*1mm or 10×10*2mm\u003c\/h3\u003e\n\u003cp style=\"text-align: center;\"\u003e \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0909\/0452\/7174\/files\/Typical-STM-image-of-HOPG-surface-20121016071045.jpg?v=1771144867\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eHighly Ordered Pyrolytic Graphite (HOPG), grade\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eZYA\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ewith mosaic spread 0.4°±0.1°, chip size 10×10mm and thickness either 1 or 2mm.\u003c\/p\u003e\n\u003cp\u003eGrade ZYA is the highest quality HOPG and it is intended for instrument calibration. Virtually no steps can be seen on the cleaved surfaces.\u003c\/p\u003e\n\u003cp\u003eMikroMasch offers HOPG grades\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eZYA\u003c\/strong\u003e, \u003cstrong\u003eZYB\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eand\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eZYH\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eFor more detailed information on HOPG please check the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eHOPG General Description \u003c\/strong\u003e(above).\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2 class=\"title title--sxl\"\u003e\u003cspan style=\"color: rgb(255, 128, 0);\"\u003eHOPG-ZYB\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch3 class=\"title title--xsm-secondary sbo-xxxs-constant\"\u003eHOPG with mosaic spread value 0.8°±0.2°, double sided, 10×10*1mm or 10×10*2mm\u003c\/h3\u003e\n\u003cp style=\"text-align: center;\"\u003e \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0909\/0452\/7174\/files\/Typical-STM-image-of-HOPG-surface-20121016071045.jpg?v=1771144867\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003eHighly Ordered Pyrolytic Graphite (HOPG), grade\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eZYB\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ewith mosaic spread 0.8°±0.2°, chip size 10x10mm and thickness either 1 or 2mm.\u003c\/p\u003e\n\u003cp\u003eGrade ZYB is suitable for most research applications, where samples must be mounted for observation and analysis.\u003c\/p\u003e\n\u003cp\u003eMikroMasch offers HOPG grades\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eZYA\u003c\/strong\u003e, \u003cstrong\u003eZYB\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eand\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eZYH\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eFor more detailed information on HOPG please check the \u003cstrong\u003eHOPG General Description \u003c\/strong\u003e(above).\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2 class=\"title title--sxl\"\u003e\u003cspan style=\"color: rgb(255, 128, 0);\"\u003eHOPG-ZYH\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch3 class=\"title title--xsm-secondary sbo-xxxs-constant\"\u003eHOPG with mozaic spread value 3.5°±1.5°, double sided, 10×10*1mm or 10×10*2mm\u003c\/h3\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0909\/0452\/7174\/files\/Typical-STM-image-of-HOPG-surface-20121016071045.jpg?v=1771144867\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eHighly Ordered Pyrolytic Graphite (HOPG), grade\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eZYH\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ewith mosaic spread 3.5°±1.5°, chip size 10×10mm and thickness either 1 or 2mm.\u003c\/p\u003e\n\u003cp\u003eGrade ZYH is low-cost HOPG that is suitable for non-critical work and student training.\u003c\/p\u003e\n\u003cp\u003eMikroMasch offers HOPG grades\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eZYA\u003c\/strong\u003e, \u003cstrong\u003eZYB\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eand\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eZYH\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eFor more detailed information on HOPG please check the \u003cstrong\u003eHOPG General Description \u003c\/strong\u003e(above).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"MikroMasch","offers":[{"title":"HOPG with mosaic spread value 0.4°±0.1°, double sided, 10×10*1mm (Unit: each)","offer_id":55984923836742,"sku":"HOPG\/ZYA\/DS\/1-1","price":3005.36,"currency_code":"RON","in_stock":true},{"title":"HOPG with mosaic spread value 0.4°±0.1°, double sided, 10×10*2mm (Unit: each)","offer_id":55984935207238,"sku":"HOPG\/ZYA\/DS\/2-1","price":4690.61,"currency_code":"RON","in_stock":true},{"title":"HOPG with mosaic spread value 0.8°±0.2°, double sided, 10×10*1mm (Unit: each)","offer_id":55984936223046,"sku":"HOPG\/ZYB\/DS\/1-1","price":893.18,"currency_code":"RON","in_stock":true},{"title":"HOPG with mosaic spread value 0.8°±0.2°, double sided, 10×10*2mm (Unit: each)","offer_id":55984937828678,"sku":"HOPG\/ZYB\/DS\/2-1","price":1516.73,"currency_code":"RON","in_stock":true},{"title":"HOPG with mosaic spread value 3.5°±1.5°, double sided, 10×10*1mm (Unit: each)","offer_id":55984940450118,"sku":"HOPG\/ZYH\/DS\/1-1","price":432.55,"currency_code":"RON","in_stock":true},{"title":"HOPG with mosaic spread value 3.5°±1.5°, double sided, 10×10*1mm, pkg\/5 (Unit: each)","offer_id":55984940581190,"sku":"HOPG\/ZYH\/DS\/1-5","price":1909.95,"currency_code":"RON","in_stock":true},{"title":"HOPG with mosaic spread value 3.5°±1.5°, double sided, 10×10*2mm (Unit: each)","offer_id":55984940908870,"sku":"HOPG\/ZYH\/DS\/2-1","price":617.93,"currency_code":"RON","in_stock":true},{"title":"HOPG with mosaic spread value 3.5°±1.5°, double sided, 10×10*2mm, pkg\/5 (Unit: each)","offer_id":55984940941638,"sku":"HOPG\/ZYH\/DS\/2-5","price":2780.66,"currency_code":"RON","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/0452\/7174\/files\/Highly-Oriented-Pyrolitic-Graphit-20121016071022.jpg?v=1771144264","url":"https:\/\/allemee.com\/products\/hopg","provider":"AllEm","version":"1.0","type":"link"}