Ko M., Aykanat A., Smith M.K. et al. · Sensors (Switzerland) · 2017 · 2192
Open a family to keep every result attached to its sample, method and conditions.
Paraphrased for this database from the authors’ stated interpretations — never quoted verbatim — and kept separate from reported measurements.
The four-component M3HHTP2/graphite chemiresistor array detects and differentiates NH3, NO and H2S at ppm concentrations.
Caveat: LOD for H2S is above the cited 10 ppm 8 h PEL; full PCA tables are in missing SI.
9-10 of 17 · Results 3.4.2-3.4.3 · Figure 3 · Linked to 4 structured results
The main limitation is relatively high limits of detection compared with metal-oxide and conductive-polymer chemiresistors, possibly linked to amorphization/densification, blocked pores and reduced active surface area after ball milling.
Caveat: Causal link to blocked pores is a proposed explanation, not directly proven by analyte uptake measurements.
12 of 17 · Conclusions · Linked to 5 structured results
Graphite in the MOF/graphite blend improves electrode contact, improves inter-crystallite electrical contact/percolation, and acts as a binder for smooth mechanical-abrasion deposition.
Caveat: Mechanistic role is inferred by authors from conductivity, device fabrication and morphology rather than isolated contact-resistance experiments.
3 of 17 · Introduction · Figure 1B · Linked to 3 structured results
Fe3HHTP2 is assigned as a new MOF-like coordination polymer despite being largely amorphous by pXRD.
Caveat: No crystalline structure solution; assignment rests on SEM/EDS, TGA, BET and emergence of conductivity.
S9-S14 · Results 3.1 · Figures S6, S8-S10 · Linked to 3 structured results
Ball milling MOFs with graphite increases conductivity and device integrability but reduces surface area and crystallinity relative to pristine MOFs.
Caveat: Magnitude depends on the metal analogue; full SI plots are missing.
S9-S14 · Results 3.2 · Figure S8; Figure S10 · Linked to 4 structured results
Analyte responses may arise from coordination, hydrogen bonding or charge-transfer perturbations in the MOF, but the precise charge-transfer mechanism is not established by chemiresistive traces alone.
Caveat: Authors explicitly state further spectroscopic investigation is required.
11-12 of 17 · Results 3.4.5 · Figure 4 · Linked to 3 structured results
Names and aliases are kept exactly within the paper’s own identity model.
| Material | Composition | Structure context | Source |
|---|---|---|---|
| Co3HHTP2Browse family: Co₃(HHTP)₂ / Co–HHTP | Co3(HHTP)2Co acetate-derived Co nodes · 2,3,6,7,10,11-hexahydroxytriphenylene (HHTP) | 2D · Pristineisoreticular 2D M3HHTP2 metal-catecholate framework | 3 of 17 · Introduction / Results 3.1 · Figure 1A |
| Co3HHTP2/graphite blendBrowse family: Co₃(HHTP)₂ / Co–HHTP | Co3(HHTP)2 + graphite, 9:1 MOF:graphite by massCo nodes in MOF component · HHTP in MOF component; graphite conductive additive | 2D · Compositeball-milled MOF/graphite composite retaining MOF component; graphite (002) peak retained | 6-7 of 17 · Results 3.2 · Figure 2 and Figure S8 |
| Cu3HHTP2Browse family: Cu₃(HHTP)₂ / Cu–HHTP | Cu3(HHTP)2Cu acetate-derived Cu nodes · 2,3,6,7,10,11-hexahydroxytriphenylene (HHTP) | 2D · Pristineisoreticular 2D M3HHTP2 metal-catecholate framework | 3 of 17 · Introduction / Results 3.1 · Figure 1A |
| Cu3HHTP2/graphite blendBrowse family: Cu₃(HHTP)₂ / Cu–HHTP | Cu3(HHTP)2 + graphite, 9:1 MOF:graphite by massCu nodes in MOF component · HHTP in MOF component; graphite conductive additive | 2D · Compositeball-milled MOF/graphite composite retaining MOF component; graphite (002) peak retained | 6-7 of 17 · Results 3.2 · Figure 2 and Figure S8 |
| Fe3HHTP2Browse family: Fe–HHTP family | Fe3(HHTP)2Fe acetate-derived Fe nodes · 2,3,6,7,10,11-hexahydroxytriphenylene (HHTP) | unknown · PristineMOF-like Fe3HHTP2 coordination polymer; largely amorphous by pXRD | 3 of 17 · Introduction / Results 3.1 · Figure 1A |
| Fe3HHTP2/graphite blendBrowse family: Fe–HHTP family | Fe3(HHTP)2 + graphite, 9:1 MOF:graphite by massFe nodes in MOF component · HHTP in MOF component; graphite conductive additive | unknown · Compositeball-milled MOF/graphite composite retaining MOF component; graphite (002) peak retained | 6-7 of 17 · Results 3.2 · Figure 2 and Figure S8 |
| graphite control | Cnone · none | unknown · Unknowncommercial graphite powder, 2-15 um average particle size | 3 and 10 of 17 · Materials 2.2 / Results 3.4.2 · Figure 3 |
| M3HHTP2/graphite four-component sensor array | Fe3HHTP2/graphite + Co3HHTP2/graphite + Ni3HHTP2/graphite + Cu3HHTP2/graphiteFe, Co, Ni, and Cu MOF components · HHTP in each MOF component; graphite | 2D · Compositearray of four isoreticular MOF/graphite chemiresistors | 8-10 of 17 · Results 3.3-3.4.2 · Figure 3 |
| Ni3HHTP2Browse family: Ni₃(HHTP)₂ / Ni–HHTP | Ni3(HHTP)2Ni acetate-derived Ni nodes · 2,3,6,7,10,11-hexahydroxytriphenylene (HHTP) | 2D · Pristineisoreticular 2D M3HHTP2 metal-catecholate framework | 3 of 17 · Introduction / Results 3.1 · Figure 1A |
| Ni3HHTP2/graphite blendBrowse family: Ni₃(HHTP)₂ / Ni–HHTP | Ni3(HHTP)2 + graphite, 9:1 MOF:graphite by massNi nodes in MOF component · HHTP in MOF component; graphite conductive additive | 2D · Compositeball-milled MOF/graphite composite retaining MOF component; graphite (002) peak retained | 6-7 of 17 · Results 3.2 · Figure 2 and Figure S8 |
Sample form, processing state and composition status define the context for measurements.
| Sample | Form and role | Processing and geometry | Source |
|---|---|---|---|
| paper chemiresistor with Co3HHTP2/graphiteresearch_0079__mat__mat_co3hhtp2_graphite | Electrode · Target Sample · Composite | MOF/graphite pellet mechanically abraded between gold electrode gaps on paper devicespaper substrate with evaporated gold electrodes · average film thickness 0.4 um for paper chips | S4 · Results 3.3-3.4.2 · Figure 3; Figure S2 |
| Co3HHTP2/graphite blended pelletresearch_0079__mat__mat_co3hhtp2_graphite | Pellet · Target Sample · Composite | 90 mg MOF plus 10 mg graphite ball-milled at 30 Hz for 5 min, then compressed into pelletsdiameter = 6 mm; also 3 mm cylinder prepared | S8 · Materials 2.2 / Results 3.2 · Figure 1B; Table S1 |
| pure Co3HHTP2 compressed pelletresearch_0079__mat__mat_co3hhtp2 | Pellet · Pristine Control · Pristine Framework | about 90 mg MOF powder compressed at 1000 psi for 1 min for four-contact probe conductivity and abrasion trialsdiameter = 6 mm | S8 · Results 3.1 · Table S1; Figure S4 |
| pure Co3HHTP2 powderresearch_0079__mat__mat_co3hhtp2 | Powder · Pristine Control · Pristine Framework | as-synthesised precipitate; washed with water and acetone; dried overnight under reduced pressure at 85 C | 3-6 of 17 · Materials 2.1 / Results 3.1 · Figure 1A; Figures S3, S6, S8-S10 |
| paper chemiresistor with Cu3HHTP2/graphiteresearch_0079__mat__mat_cu3hhtp2_graphite | Electrode · Target Sample · Composite | MOF/graphite pellet mechanically abraded between gold electrode gaps on paper devicespaper substrate with evaporated gold electrodes · average film thickness 0.4 um for paper chips | S4 · Results 3.3-3.4.2 · Figure 3; Figure S2 |
| Cu3HHTP2/graphite blended pelletresearch_0079__mat__mat_cu3hhtp2_graphite | Pellet · Target Sample · Composite | 90 mg MOF plus 10 mg graphite ball-milled at 30 Hz for 5 min, then compressed into pelletsdiameter = 6 mm; also 3 mm cylinder prepared | S8 · Materials 2.2 / Results 3.2 · Figure 1B; Table S1 |
| two independently prepared Cu3HHTP2/graphite paper-device batchesresearch_0079__mat__mat_cu3hhtp2_graphite | Electrode · Target Sample · Composite | two 200 mg-scale HHTP batches integrated into paper devices, three devices per batchpaper devices with gold electrodes | S22 · Results 3.4.4 · Figure S18 |
| Cu3HHTP2/graphite small- and large-scale synthesis comparisonresearch_0079__mat__mat_cu3hhtp2_graphite | Electrode · Target Sample · Composite | Cu3HHTP2 prepared from 200 mg or 800 mg HHTP, then 90 mg MOF ball milled with 10 mg graphitepaper devices with gold electrodes | S23 · Results 3.4.4 · Figure S19 |
| Cu3HHTP2/graphite blend stored six monthsresearch_0079__mat__mat_cu3hhtp2_graphite | Pellet · Target Sample · Composite | Cu3HHTP2/graphite blend stored in a vial under ambient conditions for six months | S8 · Results 3.4.1 · Table S1 |
| pure Cu3HHTP2 compressed pelletresearch_0079__mat__mat_cu3hhtp2 | Pellet · Pristine Control · Pristine Framework | about 90 mg MOF powder compressed at 1000 psi for 1 min for four-contact probe conductivity and abrasion trialsdiameter = 6 mm | S8 · Results 3.1 · Table S1; Figure S4 |
| pure Cu3HHTP2 powderresearch_0079__mat__mat_cu3hhtp2 | Powder · Pristine Control · Pristine Framework | as-synthesised precipitate; washed with water and acetone; dried overnight under reduced pressure at 85 C | 3-6 of 17 · Materials 2.1 / Results 3.1 · Figure 1A; Figures S3, S6, S8-S10 |
| paper chemiresistor with Fe3HHTP2/graphiteresearch_0079__mat__mat_fe3hhtp2_graphite | Electrode · Target Sample · Composite | MOF/graphite pellet mechanically abraded between gold electrode gaps on paper devicespaper substrate with evaporated gold electrodes · average film thickness 0.4 um for paper chips | S4 · Results 3.3-3.4.2 · Figure 3; Figure S2 |
| Fe3HHTP2/graphite blended pelletresearch_0079__mat__mat_fe3hhtp2_graphite | Pellet · Target Sample · Composite | 90 mg MOF plus 10 mg graphite ball-milled at 30 Hz for 5 min, then compressed into pelletsdiameter = 6 mm; also 3 mm cylinder prepared | S8 · Materials 2.2 / Results 3.2 · Figure 1B; Table S1 |
| pure Fe3HHTP2 compressed pelletresearch_0079__mat__mat_fe3hhtp2 | Pellet · Pristine Control · Pristine Framework | about 90 mg MOF powder compressed at 1000 psi for 1 min for four-contact probe conductivity and abrasion trialsdiameter = 6 mm | S8 · Results 3.1 · Table S1; Figure S4 |
| pure Fe3HHTP2 powderresearch_0079__mat__mat_fe3hhtp2 | Powder · Pristine Control · Pristine Framework | as-synthesised precipitate; washed with water and acetone; dried overnight under reduced pressure at 85 C | 3-6 of 17 · Materials 2.1 / Results 3.1 · Figure 1A; Figures S3, S6, S8-S10 |
| graphite-only paper chemiresistor controlresearch_0079__mat__mat_graphite_control | Electrode · Composite Component · Unknown | graphite abraded as a control device within sensing arraypaper substrate with gold electrodes | 9-10 of 17 · Results 3.4.2 · Figure 3 |
| paper chip with four M3HHTP2/graphite blendsresearch_0079__mat__mat_m3hhtp2_graphite_array | Electrode · Target Sample · Composite | 15 devices on a single paper substrate; four MOF/graphite blends deposited in triplicate plus graphite controlpaper substrate with gold electrodes in a gap pattern · average film thickness 0.4 um | 8-10 of 17 · Results 3.3-3.4.2 · Figure 3 |
| paper chemiresistor with Ni3HHTP2/graphiteresearch_0079__mat__mat_ni3hhtp2_graphite | Electrode · Target Sample · Composite | MOF/graphite pellet mechanically abraded between gold electrode gaps on paper devicespaper substrate with evaporated gold electrodes · average film thickness 0.4 um for paper chips | S4 · Results 3.3-3.4.2 · Figure 3; Figure S2 |
| Ni3HHTP2/graphite blended pelletresearch_0079__mat__mat_ni3hhtp2_graphite | Pellet · Target Sample · Composite | 90 mg MOF plus 10 mg graphite ball-milled at 30 Hz for 5 min, then compressed into pelletsdiameter = 6 mm; also 3 mm cylinder prepared | S8 · Materials 2.2 / Results 3.2 · Figure 1B; Table S1 |
| pure Ni3HHTP2 compressed pelletresearch_0079__mat__mat_ni3hhtp2 | Pellet · Pristine Control · Pristine Framework | about 90 mg MOF powder compressed at 1000 psi for 1 min for four-contact probe conductivity and abrasion trialsdiameter = 6 mm | S8 · Results 3.1 · Table S1; Figure S4 |
| pure Ni3HHTP2 powderresearch_0079__mat__mat_ni3hhtp2 | Powder · Pristine Control · Pristine Framework | as-synthesised precipitate; washed with water and acetone; dried overnight under reduced pressure at 85 C | 3-6 of 17 · Materials 2.1 / Results 3.1 · Figure 1A; Figures S3, S6, S8-S10 |