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Graphene-Based Neural Probes Map Brain Activity

By MedImaging International staff writers
Posted on 13 Apr 2017
Image: Research show graphene-based transistor arrays could help map brain activity (Photo courtesy of ICN2).
Image: Research show graphene-based transistor arrays could help map brain activity (Photo courtesy of ICN2).
A new study describes how a sensor based on graphene can record brain activity in high resolution, while maintaining excellent signal to noise ratio (SNR).

The sensor, developed by researchers at Munich Technical University, the Catalan Institute of Nanoscience and Nanotechnology, and other institutions, uses an array of graphene solution-gated field-effect transistors (SGFETs). The flexible array of SGFETs allows mapping brain electrical activity with excellent SNR, as well as for recording spontaneous slow waves and pre-epileptic activity in vivo.

In studies in rats, the densely packed, miniature neural probes were placed directly on the surface of the brain, and were used to record signals generated by pre-epileptic activity, as well as the smaller levels of brain activity present during sleep and in response to visual light stimulation. The neural activity was detected through the highly localized electric fields generated when neurons fire. The researchers also determined that the graphene-based probes were non-toxic and non-inflammatory. The study was published on February 24, 2017, in 2D Materials.

“Graphene is one of the few materials that allows recording in a transistor configuration and simultaneously complies with all other requirements for neural probes such as flexibility, biocompability and chemical stability,” said lead author Benno Blaschke, MSc, of TU Munich. “Although graphene is not ideally suited for flexible electronics, it was a great challenge to transfer our fabrication process from rigid substrates to flexible ones. The next step is to optimize the wafer-scale fabrication process and improve device flexibility and stability.”

“Mechanical compliance is an important requirement for safe neural probes and interfaces. Currently, the focus is on ultra-soft materials that can adapt and conform to the brain surface,” said senior author Professor Jose Antonio Garrido, PhD, of ICN2. “Graphene neural interfaces have shown already great potential, but we have to improve on the yield and homogeneity of the device production in order to advance towards a real technology.”

Graphene is a monolayer atomic-scale honeycomb lattice of carbon atoms which combines the greatest mechanical strength ever measured in any material (natural or artificial) with very light weight and high elasticity. Graphene has unique optical and thermal properties which allow it to release energy in the form of heat in response to light input; it also has very high electrical conductivity. The high surface area allows bioconjugation with common biomolecules. Andre Geim and Kostya Novoselov of the University of Manchester (United Kingdom) were awarded the Nobel Prize in Physics in 2010 for its development.

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90 (68.902969360352): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (41.961669921875): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (39.100646972656): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (37.908554077148): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (44.822692871094): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (38.14697265625): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (37.908554077148): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (41.007995605469): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (37.193298339844): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (39.100646972656): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (81.062316894531): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (105.85784912109): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294768842 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294768842 AND published='1' LIMIT 1
105 (61.988830566406): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294768842 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294768842 AND published='1' LIMIT 1
106 (73.909759521484): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294768842 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (614.16625976562): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294768842 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (105.85784912109): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294768842 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294768842 AND published='1' LIMIT 1
109 (66.995620727539): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294768842 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294768842 AND published='1' LIMIT 1
110 (76.055526733398): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=294768842 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (773.90670776367): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=294768842 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (730.03768920898): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
113 (!!!!! 4899.0249633789): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
114 (128.03077697754): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294768842 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294768842 AND published='1' LIMIT 1
115 (80.108642578125): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294768842 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294768842 AND published='1' LIMIT 1
116 (77.962875366211): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294768842 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294768842 AND published='1' LIMIT 1
117 (60.081481933594): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294768842 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294768842 AND published='1' LIMIT 1
118 (64.849853515625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294768842 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294768842 AND published='1' LIMIT 1
119 (56.982040405273): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294768842 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294768842 AND published='1' LIMIT 1
120 (69.856643676758): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294768842 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294768842 AND published='1' LIMIT 1
121 (61.03515625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294768842 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294768842 AND published='1' LIMIT 1
122 (271.08192443848): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 56469.917297363): SELECT * FROM jos_deeppockets WHERE jos_deeppockets.cat = 10 AND jos_deeppockets.type = 'deeppockets_item' AND jos_deeppockets.published = 1 AND jos_deeppockets.created + INTERVAL 14 DAY >= NOW() ORDER BY jos_deeppockets.hits DESC LIMIT 7
124 (406.98051452637): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294768842 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294768842 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 15558.004379272): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
126 (65.803527832031): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
127 (211.95411682129): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803337 LIMIT 1
128 (43.869018554688): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803337 LIMIT 1
129 (136.13700866699): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803276 LIMIT 1
130 (44.107437133789): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803276 LIMIT 1
131 (123.97766113281): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets_archive AS dp WHERE dp.id = 294803276 LIMIT 1
132 (34.093856811523): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets_archive AS dp WHERE dp.id = 294803276 LIMIT 1
133 (185.01281738281): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294802958 LIMIT 1
134 (46.014785766602): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294802958 LIMIT 1
135 (376.93977355957): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294768842 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (227.92816162109): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294768842 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (120.87821960449): SELECT name FROM jos_deeppockets WHERE id=215
138 (41.007995605469): SELECT name FROM jos_deeppockets WHERE id=215
139 (!!!!! 2678.1558990479): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))215((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (643.01490783691): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))215((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (89.883804321289): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294768842 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294768842 AND published='1' LIMIT 1
142 (51.021575927734): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294768842 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294768842 AND published='1' LIMIT 1
143 (!!!!! 17915.964126587): TRUNCATE TABLE jos_trademed_module
144 (85.830688476562): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294768842 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (49.829483032227): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294768842 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (!!!!! 3126.1444091797): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294768842 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (85.830688476562): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294768842 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (57.93571472168): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294768842 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294768842 AND published='1' LIMIT 1
149 (44.822692871094): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294768842 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294768842 AND published='1' LIMIT 1
150 (!!!!! 1179.9335479736): SELECT jos_item.* FROM jos_item INNER JOIN jos_number ON jos_item.numberID=jos_number.id WHERE 1=1 AND (jos_item.imgMini<>'') AND jos_item.type='L' AND jos_item.numberID= ( SELECT jos_number.id FROM jos_number WHERE jos_number.journalID IN (10) and jos_number.id in (select distinct jos_number.id from jos_number join jos_item on jos_item.numberid=jos_number.id where jos_item.type='P') ORDER BY (CONVERT(SUBSTRING(issue,1,2),SIGNED) + (CONVERT(SUBSTRING(issue,3,2),SIGNED)*100)) DESC LIMIT 0,1 ) ORDER BY RAND() DESC LIMIT 6
151 (58.889389038086): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294768842 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294768842 AND published='1' LIMIT 1
152 (46.014785766602): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294768842 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294768842 AND published='1' LIMIT 1
153 (35.04753112793): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294768842 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294768842 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (31.232833862305): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=215 or channel_id is null)
155 (29.087066650391): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=215 or channel_id is null)
156 (30.994415283203): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (73.909759521484): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294768842 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294768842 AND published='1' LIMIT 1
158 (45.061111450195): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294768842 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294768842 AND published='1' LIMIT 1
159 (54.121017456055): select jos_twitters.link from jos_twitters where cat=10
160 (30.994415283203): select jos_facebook.link from jos_facebook where cat=10
161 (31.948089599609): select jos_google_plus.link from jos_google_plus where cat=10
162 (29.087066650391): select jos_linkedin.link from jos_linkedin where cat=10
163 (261.06834411621): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14202,14203)
164 (925.06408691406): insert into jos_banners_delta values (14202,'2025-06-22 05:19:12','216.73.216.120','view'),(14203,'2025-06-22 05:19:12','216.73.216.120','view')