{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:C5QCXEXC4M25VJZPYDTXDOHT4G","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":"24716a053bceea7b9e33d0955d59b4eebd91b9a5e15d4e1ebf9b45f7aa950ff3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2018-08-29T13:02:43Z","title_canon_sha256":"a2b0a9743f3c4620b1f79a2885788e6b4dae642eaf032cbe5d6f3a0a32baf4ac"},"schema_version":"1.0","source":{"id":"1808.09776","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1808.09776","created_at":"2026-05-18T00:06:54Z"},{"alias_kind":"arxiv_version","alias_value":"1808.09776v1","created_at":"2026-05-18T00:06:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1808.09776","created_at":"2026-05-18T00:06:54Z"},{"alias_kind":"pith_short_12","alias_value":"C5QCXEXC4M25","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_16","alias_value":"C5QCXEXC4M25VJZP","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_8","alias_value":"C5QCXEXC","created_at":"2026-05-18T12:32:16Z"}],"graph_snapshots":[{"event_id":"sha256:7eea18b510cce5be4e921fa7d21583dcf128008ddcdca01ef14ca20a0ccee924","target":"graph","created_at":"2026-05-18T00:06:54Z","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":"We demonstrate proof-of-concept graphene sensors for environmental monitoring of ultra-low concentration NO2 in complex environments. Robust detection in a wide range of NO2 concentrations, 10-154 ppb, was achieved, highlighting the great potential for graphene-based NO2 sensors, with applications in environmental pollution monitoring, portable monitors, automotive and mobile sensors for a global real-time monitoring network. The measurements were performed in a complex environment, combining NO2/synthetic air/water vapour, traces of other contaminants and variable temperature in an attempt to","authors_text":"Arseniy Lartsev, Christos Melios, Kieran Edmonds, Olga Kazakova, Rositsa Yakimova, Vishal Panchal","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2018-08-29T13:02:43Z","title":"Detection of ultra-low concentration NO2 in complex environment using epitaxial graphene sensors"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1808.09776","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":"sha256:349721d3d621f0c15398021e77708c68db8b5334c2714fbbe06ee7634a8de4c8","target":"record","created_at":"2026-05-18T00:06:54Z","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":"24716a053bceea7b9e33d0955d59b4eebd91b9a5e15d4e1ebf9b45f7aa950ff3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2018-08-29T13:02:43Z","title_canon_sha256":"a2b0a9743f3c4620b1f79a2885788e6b4dae642eaf032cbe5d6f3a0a32baf4ac"},"schema_version":"1.0","source":{"id":"1808.09776","kind":"arxiv","version":1}},"canonical_sha256":"17602b92e2e335daa72fc0e771b8f3e1863f17aace55b32df6a0901cfefca91c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"17602b92e2e335daa72fc0e771b8f3e1863f17aace55b32df6a0901cfefca91c","first_computed_at":"2026-05-18T00:06:54.497089Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:06:54.497089Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"u7PqUJFgZiczqcPPr0qJeMl7I8ue/MyZiagreTaMvGC5Mc2qs74oaZnkaMgUkdTLUe83XqFOGlW2iHcOxUEiDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:06:54.497716Z","signed_message":"canonical_sha256_bytes"},"source_id":"1808.09776","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:349721d3d621f0c15398021e77708c68db8b5334c2714fbbe06ee7634a8de4c8","sha256:7eea18b510cce5be4e921fa7d21583dcf128008ddcdca01ef14ca20a0ccee924"],"state_sha256":"c33a1477930cb6a9cf814a8f7fe903b61a2a018ce392da6bdaad373aed5b7428"}