{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:JR2DECUPGVFOW6IPCUXTMPKTLS","short_pith_number":"pith:JR2DECUP","canonical_record":{"source":{"id":"2606.08567","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2026-06-07T10:47:09Z","cross_cats_sorted":["physics.app-ph"],"title_canon_sha256":"f1221bb4b8c57ad5bbfea72db15561a56403962e0127dd0a00cc11a2ac11522b","abstract_canon_sha256":"7d8a0391ecb2840f01088e1c900ad2f160f2170defb7726230b3a9bf710491cb"},"schema_version":"1.0"},"canonical_sha256":"4c74320a8f354aeb790f152f363d535ca65ee88e6f7f4b53dab9a8d6ae807caf","source":{"kind":"arxiv","id":"2606.08567","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.08567","created_at":"2026-06-09T01:05:40Z"},{"alias_kind":"arxiv_version","alias_value":"2606.08567v1","created_at":"2026-06-09T01:05:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.08567","created_at":"2026-06-09T01:05:40Z"},{"alias_kind":"pith_short_12","alias_value":"JR2DECUPGVFO","created_at":"2026-06-09T01:05:40Z"},{"alias_kind":"pith_short_16","alias_value":"JR2DECUPGVFOW6IP","created_at":"2026-06-09T01:05:40Z"},{"alias_kind":"pith_short_8","alias_value":"JR2DECUP","created_at":"2026-06-09T01:05:40Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:JR2DECUPGVFOW6IPCUXTMPKTLS","target":"record","payload":{"canonical_record":{"source":{"id":"2606.08567","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2026-06-07T10:47:09Z","cross_cats_sorted":["physics.app-ph"],"title_canon_sha256":"f1221bb4b8c57ad5bbfea72db15561a56403962e0127dd0a00cc11a2ac11522b","abstract_canon_sha256":"7d8a0391ecb2840f01088e1c900ad2f160f2170defb7726230b3a9bf710491cb"},"schema_version":"1.0"},"canonical_sha256":"4c74320a8f354aeb790f152f363d535ca65ee88e6f7f4b53dab9a8d6ae807caf","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-09T01:05:40.312719Z","signature_b64":"XU2FBNtSEFgSiXMH7SHaEgjeGxWTKQE6z2kyxLhagdwTdny+bTyeF2xvM+jH1FmVn82ia/BEsYA4cob2qs3MAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4c74320a8f354aeb790f152f363d535ca65ee88e6f7f4b53dab9a8d6ae807caf","last_reissued_at":"2026-06-09T01:05:40.312297Z","signature_status":"signed_v1","first_computed_at":"2026-06-09T01:05:40.312297Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2606.08567","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-06-09T01:05:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mguf0gEzaKqWKEnLXS6x3djhLyHpmLtqrjsFKugvwE1ubIiW6Bpg3M+8RukjWqh7eId1xuVg1K8WtWhENzg5BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-30T20:07:00.659287Z"},"content_sha256":"60860885680f59071434c2b7696d90c51860e5e6184285e32291a41dfeda904c","schema_version":"1.0","event_id":"sha256:60860885680f59071434c2b7696d90c51860e5e6184285e32291a41dfeda904c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:JR2DECUPGVFOW6IPCUXTMPKTLS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"V-Doped Niobate Nanosheets for Enhanced Photocatalytic Activity","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.app-ph"],"primary_cat":"cond-mat.mtrl-sci","authors_text":"M. Tu\\u{g}rul Avcu, U\\u{g}ur \\\"Unal","submitted_at":"2026-06-07T10:47:09Z","abstract_excerpt":"V-doped [Ca$_{2}$Nb$_{3-x}$V$_{x}$O$_{10}$]$^{-}$ (x = 0, 0.15, 0.3, 0.6, 0.75) nanosheets were produced by solid state reaction followed by protonation and exfoliation by tetrabutylammonium ions. 2D nanosheets have improved photocatalytic activity due to their small thickness that reduces electron-hole recombination, larger surface area that increases photocatalytic sites, and decreased band gap from added V. V-doping has caused the wide band gap of 3.54 eV of undoped nanosheets to decrease to 2.60-2.88 eV range. 10 vol% methanol was used as a hole scavenger in the hydrogen evolution reaction"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.08567","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2606.08567/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-06-09T01:05:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fIG75yOVHs7MppmzHgLNycPV9LVLSMCCeZNLq4fDed9zcvGg62/zIDaOpaI99h6JRpwrQHsW9tFBKKLYEJ/PDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-30T20:07:00.659689Z"},"content_sha256":"146be1fee56ae318d209f7cd31473da5d3043b109b18860ab6afe0eb11862eda","schema_version":"1.0","event_id":"sha256:146be1fee56ae318d209f7cd31473da5d3043b109b18860ab6afe0eb11862eda"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/JR2DECUPGVFOW6IPCUXTMPKTLS/bundle.json","state_url":"https://pith.science/pith/JR2DECUPGVFOW6IPCUXTMPKTLS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/JR2DECUPGVFOW6IPCUXTMPKTLS/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-30T20:07:00Z","links":{"resolver":"https://pith.science/pith/JR2DECUPGVFOW6IPCUXTMPKTLS","bundle":"https://pith.science/pith/JR2DECUPGVFOW6IPCUXTMPKTLS/bundle.json","state":"https://pith.science/pith/JR2DECUPGVFOW6IPCUXTMPKTLS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/JR2DECUPGVFOW6IPCUXTMPKTLS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:JR2DECUPGVFOW6IPCUXTMPKTLS","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":"7d8a0391ecb2840f01088e1c900ad2f160f2170defb7726230b3a9bf710491cb","cross_cats_sorted":["physics.app-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2026-06-07T10:47:09Z","title_canon_sha256":"f1221bb4b8c57ad5bbfea72db15561a56403962e0127dd0a00cc11a2ac11522b"},"schema_version":"1.0","source":{"id":"2606.08567","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.08567","created_at":"2026-06-09T01:05:40Z"},{"alias_kind":"arxiv_version","alias_value":"2606.08567v1","created_at":"2026-06-09T01:05:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.08567","created_at":"2026-06-09T01:05:40Z"},{"alias_kind":"pith_short_12","alias_value":"JR2DECUPGVFO","created_at":"2026-06-09T01:05:40Z"},{"alias_kind":"pith_short_16","alias_value":"JR2DECUPGVFOW6IP","created_at":"2026-06-09T01:05:40Z"},{"alias_kind":"pith_short_8","alias_value":"JR2DECUP","created_at":"2026-06-09T01:05:40Z"}],"graph_snapshots":[{"event_id":"sha256:146be1fee56ae318d209f7cd31473da5d3043b109b18860ab6afe0eb11862eda","target":"graph","created_at":"2026-06-09T01:05:40Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2606.08567/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"V-doped [Ca$_{2}$Nb$_{3-x}$V$_{x}$O$_{10}$]$^{-}$ (x = 0, 0.15, 0.3, 0.6, 0.75) nanosheets were produced by solid state reaction followed by protonation and exfoliation by tetrabutylammonium ions. 2D nanosheets have improved photocatalytic activity due to their small thickness that reduces electron-hole recombination, larger surface area that increases photocatalytic sites, and decreased band gap from added V. V-doping has caused the wide band gap of 3.54 eV of undoped nanosheets to decrease to 2.60-2.88 eV range. 10 vol% methanol was used as a hole scavenger in the hydrogen evolution reaction","authors_text":"M. Tu\\u{g}rul Avcu, U\\u{g}ur \\\"Unal","cross_cats":["physics.app-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2026-06-07T10:47:09Z","title":"V-Doped Niobate Nanosheets for Enhanced Photocatalytic Activity"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.08567","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":"sha256:60860885680f59071434c2b7696d90c51860e5e6184285e32291a41dfeda904c","target":"record","created_at":"2026-06-09T01:05:40Z","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":"7d8a0391ecb2840f01088e1c900ad2f160f2170defb7726230b3a9bf710491cb","cross_cats_sorted":["physics.app-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2026-06-07T10:47:09Z","title_canon_sha256":"f1221bb4b8c57ad5bbfea72db15561a56403962e0127dd0a00cc11a2ac11522b"},"schema_version":"1.0","source":{"id":"2606.08567","kind":"arxiv","version":1}},"canonical_sha256":"4c74320a8f354aeb790f152f363d535ca65ee88e6f7f4b53dab9a8d6ae807caf","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4c74320a8f354aeb790f152f363d535ca65ee88e6f7f4b53dab9a8d6ae807caf","first_computed_at":"2026-06-09T01:05:40.312297Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-09T01:05:40.312297Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"XU2FBNtSEFgSiXMH7SHaEgjeGxWTKQE6z2kyxLhagdwTdny+bTyeF2xvM+jH1FmVn82ia/BEsYA4cob2qs3MAA==","signature_status":"signed_v1","signed_at":"2026-06-09T01:05:40.312719Z","signed_message":"canonical_sha256_bytes"},"source_id":"2606.08567","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:60860885680f59071434c2b7696d90c51860e5e6184285e32291a41dfeda904c","sha256:146be1fee56ae318d209f7cd31473da5d3043b109b18860ab6afe0eb11862eda"],"state_sha256":"a89d404f63d830a54edbb9c6b9e4617bc58ad1ac1c1089b097cb71fd10f89c59"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"H1ttrb3rwJPSSc4g39I5sYuD1JLrp3tQPvhgfajDsEG3jgxRXbgfsB64L8tcXCZEpJkxYXYT1M9RuUirH4CmDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-30T20:07:00.661829Z","bundle_sha256":"e5980751df0c0c314529a7ea96ba12dc64097229b4abac90b6fed9c7058816f3"}}