Zhao X., Jiang S., Zhang Z. et al. · ACS Sensors · 2024 · 5512-5519
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.
Co1.8Ni1.2(HITP)2 remains structurally stable after pH 1 acid soaking and after 60 days of sensor cycling.
Caveat: Acid stability Rwp/Rp values were read from figure annotations; detailed raw diffraction data were not available.
3 · 2.1. Sample Preparation and Characterization · Figures S2-S4 · Linked to 3 structured results
The Co1.8Ni1.2(HITP)2 sensor maintains stable H2S response for 60 days in SF6 with less than 4.13% response drift.
Caveat: Device testing was under controlled laboratory gas delivery, not field deployment.
6 · 3. Conclusions · Figure 4e · Linked to 3 structured results
Co1.8Ni1.2(HITP)2, with Co:Ni around 3:2, is the optimal H2S responder among the screened CoxNi3-x(HITP)2 sensors.
Caveat: Most screening bar-chart values for non-optimal compositions are graphical and were not exhaustively digitised.
5 · Figure 4 caption · Figure 4a,b · Linked to 3 structured results
Co1.8Ni1.2(HITP)2 forms a genuine mixed-metal bimetallic phase rather than segregated Co3(HITP)2 and Ni3(HITP)2 particles.
Caveat: Based on authors' EDS/XRD interpretation; no CIF was supplied in the prompt.
3 · 2.1. Sample Preparation and Characterization · Figure 1g · Linked to 2 structured results
The bimetallic Co1.8Ni1.2(HITP)2 framework has higher conductivity than either monometallic Co3(HITP)2 or Ni3(HITP)2.
Caveat: Only three explicit conductivity values were reported in text.
3 · 2.1. Sample Preparation and Characterization · Linked to 3 structured results
The conductive MOF sensor detects H2S in oxygen-deficient atmospheres because the adsorption process involves direct H2S-framework interaction and charge transfer rather than oxygen-mediated redox chemistry.
Caveat: Mechanistic support combines DFT with spectroscopy after H2S exposure; direct operando charge-transfer quantification was not reported.
6 · 2.4. Gas-Sensing Mechanism · Figure 5 · Linked to 4 structured results
Names and aliases are kept exactly within the paper’s own identity model.
| Material | Composition | Structure context | Source |
|---|---|---|---|
| Co0.6Ni2.4(HITP)2Browse family: Co/Ni–HITP family | Co0.6Ni2.4(HITP)2Co/Ni mixed nodes, nominal Co:Ni = 1:4 · HITP | 2D · PristineMixed-metal 2D CoxNi3-x(HITP)2 phase. | 22 · Table S1 · Table S1 |
| Co1.2Ni1.8(HITP)2Browse family: Co/Ni–HITP family | Co1.2Ni1.8(HITP)2Co/Ni mixed nodes, nominal Co:Ni = 2:3 · HITP | 2D · PristineMixed-metal 2D CoxNi3-x(HITP)2 phase. | 22 · Table S1 · Table S1 |
| Co1.5Ni1.5(HITP)2Browse family: Co/Ni–HITP family | Co1.5Ni1.5(HITP)2Co/Ni mixed nodes, nominal Co:Ni = 1:1 · HITP | 2D · PristineMixed-metal 2D CoxNi3-x(HITP)2 phase. | 22 · Table S1 · Table S1 |
| Co1.8Ni1.2(HITP)2Browse family: Co/Ni–HITP family | Co1.8Ni1.2(HITP)2Co/Ni mixed nodes, optimal nominal Co:Ni = 3:2 · HITP | 2D · PristineGenuine bimetallic 2D layered honeycomb phase; EDS mapping shows homogeneous C, N, Co and Ni distribution. | 3 · 2.1. Sample Preparation and Characterization · Figure 1 |
| Co2.4Ni0.6(HITP)2Browse family: Co/Ni–HITP family | Co2.4Ni0.6(HITP)2Co/Ni mixed nodes, nominal Co:Ni = 4:1 · HITP | 2D · PristineMixed-metal 2D CoxNi3-x(HITP)2 phase. | 22 · Table S1 · Table S1 |
| Co3(HITP)2Browse family: Co₃(HITP)₂ / Co–HITP | Co3(HITP)2Co nodes · HITP | 2D · Pristine2D layered conductive HITP framework with square-planar Co-N coordination. | 3 · 2.1. Sample Preparation and Characterization · Figures 2, S9 |
| CoxNi3-x(HITP)2 mixed-metal conductive MOF familyBrowse family: Co/Ni–HITP family | CoxNi3-x(HITP)2Co and Ni square-planar metal nodes · 2,3,6,7,10,11-hexaiminotriphenylene (HITP) | 2D · PristineLayered 2D honeycomb lattice; metal atoms coordinated by four nitrogen atoms from the ligand and stacked through pi-pi interactions. | 2 · 2.1. Sample Preparation and Characterization · Figure S1 |
| Ni3(HITP)2Browse family: Ni₃(HITP)₂ / Ni–HITP | Ni3(HITP)2Ni nodes · HITP | 2D · Pristine2D layered conductive HITP framework with M-N coordination; used as a monometallic comparison material. | 3 · 2.1. Sample Preparation and Characterization · Figures 2, S8 |
Sample form, processing state and composition status define the context for measurements.
| Sample | Form and role | Processing and geometry | Source |
|---|---|---|---|
| Co0.6Ni2.4(HITP)2 powderresearch_0882__mat__mat_co06ni24_hitp2 | Powder · Pristine Control · Mixed Metal | black powder from mixed Co/Ni water-bath synthesis | 22 · Table S1 · Table S1 |
| Co1.2Ni1.8(HITP)2 powderresearch_0882__mat__mat_co12ni18_hitp2 | Powder · Pristine Control · Mixed Metal | black powder from mixed Co/Ni water-bath synthesis | 22 · Table S1 · Table S1 |
| Co1.5Ni1.5(HITP)2 powderresearch_0882__mat__mat_co15ni15_hitp2 | Powder · Pristine Control · Mixed Metal | black powder from mixed Co/Ni water-bath synthesis | 22 · Table S1 · Table S1 |
| Co1.8Ni1.2(HITP)2 powderresearch_0882__mat__mat_co18ni12_hitp2 | Powder · Target Sample · Mixed Metal | black powder from mixed Co/Ni water-bath synthesis; thermally treated under dynamic vacuum at 90 C before N2 adsorption | 22 · Table S1 · Table S1 |
| Co1.8Ni1.2(HITP)2 chemiresistive gas sensor on Au IDE chipresearch_0882__mat__mat_co18ni12_hitp2 | Electrode · Target Sample · Mixed Metal | Co1.8Ni1.2(HITP)2 used as sensing material on 3 x 4.5 mm2 Au IDE chipAu interdigitated electrodes on silicon wafer chip | 4 · 2.2. Chip Design and Fabrication · Figure 3 |
| Co2.4Ni0.6(HITP)2 powderresearch_0882__mat__mat_co24ni06_hitp2 | Powder · Pristine Control · Mixed Metal | black powder from mixed Co/Ni water-bath synthesis | 22 · Table S1 · Table S1 |
| Co3(HITP)2 powderresearch_0882__mat__mat_co3_hitp2 | Powder · Pristine Control · Pristine Framework | black powder dried in vacuum oven at 65 C after washing and suction filtration | 2 · Preparation of Co3(HITP)2 |
| Co1.8Ni1.2(HITP)2 DFT modelresearch_0882__mat__mat_co18ni12_hitp2 | Model · Model System · Model | optimised computational structure for H2S adsorption | 6 · 2.4. Gas-Sensing Mechanism · Figure 5 |
| Co3(HITP)2 DFT modelresearch_0882__mat__mat_co3_hitp2 | Model · Model System · Model | optimised computational structure for H2S adsorption | 6 · 2.4. Gas-Sensing Mechanism · Figure 5 |
| Ni3(HITP)2 DFT modelresearch_0882__mat__mat_ni3_hitp2 | Model · Model System · Model | optimised computational structure for H2S adsorption | 6 · 2.4. Gas-Sensing Mechanism · Figure 5 |
| Ni3(HITP)2 powderresearch_0882__mat__mat_ni3_hitp2 | Powder · Pristine Control · Pristine Framework | black powder dried in vacuum oven at 65 C after washing with water and methanol | 2 · Preparation of Ni3(HITP)2 |