{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:FEJIVBSGMYEBKR5KVZQKTYTKXN","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"52bff62779e069bb180f7890e3a719489012974f0f87f35adbd49a4439b4f341","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2011-03-31T13:33:53Z","title_canon_sha256":"cbacc017020083eb563221eef678e5bb18bb2448e5a41293062c151bdae0dbc2"},"schema_version":"1.0","source":{"id":"1103.6177","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1103.6177","created_at":"2026-05-18T04:25:13Z"},{"alias_kind":"arxiv_version","alias_value":"1103.6177v1","created_at":"2026-05-18T04:25:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1103.6177","created_at":"2026-05-18T04:25:13Z"},{"alias_kind":"pith_short_12","alias_value":"FEJIVBSGMYEB","created_at":"2026-05-18T12:26:28Z"},{"alias_kind":"pith_short_16","alias_value":"FEJIVBSGMYEBKR5K","created_at":"2026-05-18T12:26:28Z"},{"alias_kind":"pith_short_8","alias_value":"FEJIVBSG","created_at":"2026-05-18T12:26:28Z"}],"graph_snapshots":[{"event_id":"sha256:00db3d5047285785f8c07c5a177c670232a507b892d968a7981963c9c83cf494","target":"graph","created_at":"2026-05-18T04:25:13Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"A simple and effective stepwise-method has been developed to remove defects from the top graphene layers of highly orientated pyrolytic graphite. Using a combination of ozone exposure and moderately high temperature we have shown that a defect-rich graphite surface can be modified to generate a graphene-like surface containing a negligible amount of oxygen, hydrogen and sp3 carbon. We report definitive x-ray photoelectron and x-ray absorption spectroscopy analysis after each stage of the process, suggest a mechanism by which the modification occurs and propose it as a route towards the prepara","authors_text":"H. Grennberg, M. J. Webb, O. Karis, P. Pal, P. Palmgren","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2011-03-31T13:33:53Z","title":"A simple method to produce almost perfect graphene on highly oriented pyrolytic graphite"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1103.6177","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:fa92448ea6bbe3177af548de8439a4913fb21582af9c35f5659acfab739e7ccd","target":"record","created_at":"2026-05-18T04:25:13Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"52bff62779e069bb180f7890e3a719489012974f0f87f35adbd49a4439b4f341","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2011-03-31T13:33:53Z","title_canon_sha256":"cbacc017020083eb563221eef678e5bb18bb2448e5a41293062c151bdae0dbc2"},"schema_version":"1.0","source":{"id":"1103.6177","kind":"arxiv","version":1}},"canonical_sha256":"29128a864666081547aaae60a9e26abb733e05ea007e436925d1d9b741a943dd","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"29128a864666081547aaae60a9e26abb733e05ea007e436925d1d9b741a943dd","first_computed_at":"2026-05-18T04:25:13.804100Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:25:13.804100Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"yeP1ch0+MF0JBB+rHSqE4mvmj4aUxJVMY40QzW6u0x+L47gj797ybBEapJY7uQXDa1x7l1wus78LAfV06LtiDw==","signature_status":"signed_v1","signed_at":"2026-05-18T04:25:13.804610Z","signed_message":"canonical_sha256_bytes"},"source_id":"1103.6177","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fa92448ea6bbe3177af548de8439a4913fb21582af9c35f5659acfab739e7ccd","sha256:00db3d5047285785f8c07c5a177c670232a507b892d968a7981963c9c83cf494"],"state_sha256":"ce93773c1879f50639e41d3c6a6eaeb8e317402a5795c825b446a18391b613a2"}