Primary studyCore evidenceThin Film Device

Layer-by-layer assembled dual-ligand conductive MOF nano-films with modulated chemiresistive sensitivity and selectivity

Wu A.-Q., Wang W.-Q., Zhan H.-B. et al. · Nano Research · 2021 · 438-443

3materials
9samples
2synthesis routes
12measurements
43results
6claims and caveats

Evidence map

Open a family to keep every result attached to its sample, method and conditions.

Author interpretations and caveats

Paraphrased for this database from the authors’ stated interpretations — never quoted verbatim — and kept separate from reported measurements.

Application RelevanceSupport assessment: High

HITP doping modulates chemiresistive sensitivity and selectivity, reversing relative sensitivity toward NH3 and benzene and giving over 220% benzene/NH3 selectivity improvement.

Caveat: Detailed gas-sensor operating conditions come from SI, not the main text.

p003 / article p.440 · Results and discussion · Fig. 3(d) · Linked to 3 structured results

CaveatSupport assessment: High

The exact mechanism for the sensing performance of Cu-HHTP/HITP and related EC-MOFs remains difficult to reveal.

p004 / article p.441 · Results and discussion

Phase AssignmentSupport assessment: High

HITP was successfully doped into the Cu-HHTP thin-film framework, and the HITP/HHTP ratio increased with mixed-ligand feed ratio.

Caveat: Quantitative fitted composition ratios are not reported.

p002 / article p.439 · Results and discussion · Fig. 2(d,e); Fig. S7 · Linked to 5 structured results

Structure Property LinkSupport assessment: High

The spray LbL process gives pinhole-free, dense, continuous HITP-doped Cu-HHTP nanofilms with controlled nanometre-scale thickness.

Caveat: Roughness values beyond the reported upper bound were visually estimated from figure axes.

p002 / article p.439 · Results and discussion · Fig. 2(a,b); Figs. S1-S6 · Linked to 5 structured results

Transport MechanismSupport assessment: Medium

Rich defects in films with 1.0-10.0 mol% HITP may favour charge transfer with benzene and TEA, explaining strong selectivity improvements.

Caveat: The authors explicitly state that the exact sensing mechanism is difficult to reveal.

p004 / article p.441 · Results and discussion · Figs. 3(f), 4 · Linked to 4 structured results

Transport MechanismSupport assessment: Medium

Low-level HITP doping increases sigma/C0 by about two orders of magnitude, attributed to conductive Cu-o-phenylenediamine coordination linkages, while higher dopant fractions give less additional gain because film quality declines.

Caveat: Only sigma/C0 (I/d) is reported for the films, not an absolute conductivity in S cm-1.

p002 / article p.439 · Results and discussion · Fig. 2(c) · Linked to 4 structured results

Material identities

Names and aliases are kept exactly within the paper’s own identity model.

MaterialCompositionStructure contextSource
Cu-HHTP / Cu3(HHTP)2Browse family: Cu₃(HHTP)₂ / Cu–HHTPCu3(HHTP)2Cu ions / Cu-ligand sheets · 2,3,6,7,10,11-hexahydroxytriphenylene or hexahydrotriphenylene as printed (HHTP, -OH)2D · PristineHoneycomb-like porous framework with 2D hexagonal Cu-ligand layers in the ab plane, slipped-parallel AB stacking along c, and 1D channels.p002 / article p.439 · Results and discussion · Fig. 1
Cu-HITP / Cu3(HITP)2Browse family: Cu₃(HITP)₂ / Cu–HITPCu3(HITP)2Cu ions / Cu-ligand sheets · 2,3,6,7,10,11-hexaiminotriphenylene or hexaiminotriphenylene as printed (HITP, -NH2)2D · PristineIsostructural pristine framework to Cu3(HHTP)2 with honeycomb-like porous 2D layers.p001-p002 / article pp.438-439 · Introduction; Results and discussion · Fig. 1
HITP-doped Cu-HHTP-10CHITP-doped Cu3(HHTP)2 / Cu-HHTP-HITPCu ions · Mixed HHTP and HITP ligands2D · PristineHexagonal dual-ligand electronically conductive MOF nanofilm made by 10-cycle spray layer-by-layer liquid-phase epitaxy; HITP is incorporated as a dopant in the Cu-HHTP framework.p001 / article p.438 · Introduction · Fig. 1

Sample register

Sample form, processing state and composition status define the context for measurements.

Show 9 sample records
SampleForm and roleProcessing and geometrySource
pristine Cu3(HHTP)2-10C thin filmresearch_0084__mat__mat_cu_hhtpThin Film · Pristine Control · Pristine FrameworkSpray LbL 10-cycle thin-film control; standalone pristine recipe not separately detailed in SI.OH-functionalised substrates; used as a comparator to HITP-doped films · about 18-20 nm from Fig. 2(b) visual readp002 / article p.439 · Results and discussion · Fig. 2(b)
pristine Cu-HHTP literature pellet comparatorresearch_0084__mat__mat_cu_hhtpPellet · Pristine Control · Pristine FrameworkLiterature comparator; not prepared in this article.p003 / article p.440 · Results and discussion
pristine Cu-HITP literature pellet comparatorresearch_0084__mat__mat_cu_hitpPellet · Pristine Control · Pristine FrameworkLiterature comparator; not prepared in this article.p003 / article p.440 · Results and discussion
0.1 mol% HITP doped Cu-HHTP-10Cresearch_0084__mat__mat_hitp_doped_cu_hhtpThin Film · Target Sample · DopedActivated HITP-doped nanofilm after 10 spray LbL cycles.OH-functionalised substrate; sapphire/Au interdigital electrodes for sensing · AFM edge values about 17.8-20.7 nm; mean about 19 nm from Fig. S1 visual readp002 / SI p.2 · Figure caption · Fig. S1
0.5 mol% HITP doped Cu-HHTP-10Cresearch_0084__mat__mat_hitp_doped_cu_hhtpThin Film · Target Sample · DopedActivated HITP-doped nanofilm after 10 spray LbL cycles.OH-functionalised substrate; sapphire/Au interdigital electrodes for sensing · AFM edge values about 27.6-29.8 nm; mean about 29 nm from Fig. S2 visual readp003 / SI p.3 · Figure caption · Fig. S2
10.0 mol% HITP doped Cu-HHTP-10Cresearch_0084__mat__mat_hitp_doped_cu_hhtpThin Film · Target Sample · DopedActivated HITP-doped nanofilm after 10 spray LbL cycles.OH-functionalised substrate; sapphire/Au interdigital electrodes for sensing · AFM edge values about 65.0-69.8 nm; mean about 67 nm from Fig. S5 visual readp006 / SI p.6 · Figure caption · Fig. S5
1.0 mol% HITP doped Cu-HHTP-10Cresearch_0084__mat__mat_hitp_doped_cu_hhtpThin Film · Target Sample · DopedActivated HITP-doped nanofilm after 10 spray LbL cycles.OH-functionalised substrate; sapphire/Au interdigital electrodes for sensing · AFM edge values about 25.0-26.0 nm; mean about 25.5 nm from Fig. S3 visual readp004 / SI p.4 · Figure caption · Fig. S3
5.0 mol% HITP doped Cu-HHTP-10Cresearch_0084__mat__mat_hitp_doped_cu_hhtpThin Film · Target Sample · DopedActivated HITP-doped nanofilm after 10 spray LbL cycles.OH-functionalised substrate; sapphire/Au interdigital electrodes for sensing · AFM edge values about 46.1-47.9 nm; mean about 47 nm from Fig. S4 visual readp005 / SI p.5 · Figure caption · Fig. S4
x mol% HITP doped Cu-HHTP-10C nanofilm seriesresearch_0084__mat__mat_hitp_doped_cu_hhtpThin Film · Target Sample · DopedSpray LbL 10-cycle films activated by successive immersion in DMF for 2 h and ethanol for 12 h at room temperature, then dried by N2.OH-functionalised sapphire, Si/SiO2, quartz, glass, or Au-interdigital-electrode substrates depending on measurement; sapphire/Au electrodes for sensors · 20-70 nm overall; all <80 nm by main-text reportp001 / SI p.1 · Fabrication of HITP doped Cu3(HHTP)2-10C thin film