Table 1.

Syntheses of all samples.

Sample	Heating method	Synthesis temperature (°C)	Ramp heating step (min)	Hold time	Zn(NO3)2 (mmol)	Cu(NO3)2 (mmol)
BM1	Microwave	240	15	30 min	2	2
BM2	Microwave	260	16	30 min	2	2
BM3	Solvothermal	240	45	8 h	0.5	0.5
BM4	Solvothermal	240	45	8 h	0.33	0.67
BM5	Microwave	240	15	30 min	1.33	2.67
BM6	Solvothermal	240	45	8 h	0.67	0.33
BM7	Microwave	240	15	30 min	2.67	1.33